NORTH AMERICAN COLEOPTERA. 41 Arizona (Morrison).
Tlie mentum in this species is very large, strongly rounded anteriorly, with a very short, rounded, and somewhat feeble eniargination at the immediate apex ; its exposed surface is deeply and closely punctate. There is but one specimen before me, but it appears to be very distinct from any with which it has been compared. The punctures of the elytra, although equidistant among themselves, can, in the middle of the disk, be very readily caused by the eye to arrange themselves in striae-like rows.
E. emargiliatum n. sp. — Form rather elongated, convex ; pubescence almost entirely absent from the head and pronotum, on the elytra it consists of erect, coarse, evenly distributed, and sparse setae, which are piceo-cinereous in color ; general color of the body dark piceous-brown, nearly black above, very slightly paler beneath, antennae and legs extremely dark rufotestaceous. Head moderate, slightly wider than long ; interocular surface very convex between the eyes, then broadly declivous, becoming transversely and very feebly ridged just behind the anterior margin, the latter squarely truncate in the middle, rounded at the sides ; punctures of head very sparse in the middle, denser toward the sides, very dense and deeper near the anterior margin ; supra-ocular ridges rather short but very distinct ; labrum just visibly emarginate in the middle, provided anteriorly with a dense fringe of porrected setae, broadly rounded at the sides ; antennae as long as the anterior width of prothorax, third joint just visibly longer than the fourth, joints five to seven shorter, sub-equal, joints eight to ten wider, flattened, sub-triangular, increasing in size, ninth and tenth notched at the apex, eleventh longer than wide, narrower, regularly oval. Prothorax nearly twice as wide as long, base just perceptibly longer than the apex, evenly and feebly arcuate at the sides, broadly and very feebly emarginate throughout anteriorly, very feebly trisinuate posteriorly ; anterior and posterior angles very acute ; disk very convex, feebly and rather closely punctate ; at the sides the punctures become longer, more shallow, closer, and more variolate. Scutellum as in E. piceum. Elytra at base just perceptibly wider than the base of the pronotum ; sides very feebly divergent and nearly straight for three-fourths of the length from the humeri ; disk very convex, more than three times as long as the prothorax, rather acutely rounded behind, very feebly and narrowly impressed on the suture toward the base, feebly and minutely punctate ; punctures sparse, nearly evenly distributed, easily caused to form striae-like rows by the eye, very feebly impressed ; the entire disk is also finely, rather strongly, and transversely rugulose. Under surfaceoftheabdomenfinelypunctate,muchmorecloselysoonthelastsegment; prosternum coarsely pitted, much more sparsely so in the middle. Legs moderate ; first and last joints of the posterior tarsi equal in length, slightly longer than the second and third together. Length 6.0 mm. Arizona (Morrison).
The mentum of emarginatiim is very large, coarsely, and closely punctured, broadly rounded anteriorly, except for a space at the apex
42 TIIOS. L. CASEY.
equal to nearly one-half its width at base, which is broadly, evenly, and rather feebly emarginate. The front tibiae are strongly prolonged anteriorly in both this species and in piceum; in the latter species the interior terminal teeth are slightly curvate, and are arranged in a right line with the point of juncture of the first tarsal joint ; in the present species, however, they are in a straight line, which is at right angles to that position.
In the present chaotic state of this portion of the Tenebrionidae it seems scarcely warrantable to generically separate these species, so very similar in facies, on such a trivial character. The punctures of the head in the above-described species are very shallow and variolate. E. papagoiium n. sp. — Form rather strongly elongated, couvex ; puliesoeuce of elytra consisting of exceedingly short and sparse, erect setae, which are rather fine and arranged serially ; general tint of upper surface piceoiis-black, under surface slightly paler, rufous, legs and antennae rufous. Head distinctly broader than long ; punctures of upper surface round, nearly evenly distributed between the eyes, raoj-e closely crowded anteriorly, variolate, separated usually by their own widths ; anterior margin transverse or just perceptibly emarginate in the middle, broadly rounded at the sides ; labrum transversely truncate in the middle, sides divergent and slightly arcuate, lateral angles rather pronounced ; supra-ocular ridges strongly developed and curving outward anteriorly ; antennae distinctly longer than the anterior width of prothorax, third joint distinctly longer than the fourth. Prothorax four-fifths wider than long ; anterior margin just perceptibly shorter than the base, the latter transverse and distinctly trisinuate, the former just perceptibly emarginate, sinuate near the apical angles ; anterior and posterior angles very acute ; sides feebly arcuate, straight near the apical angles ; disk very convex, rather distantly and finely punctate in the middle, where the punctures are impressed, becoming much larger, shallower, and elongated at the sides, where they are closely crowded, variolate, and scabrous ; pronotum margined anteriorly and posteriorly, narrowly rellexed at the sides ; edges acute. Elytra at base slightly wider than the contiguous pronotum ; sides nearly parallel and almost straight for three-fourths of the lengtli from the humeri ; disk very convex, more than three times as long as the pronotum, rather acutely rounded behind, minutely, feebly, and evenly punctate in the middle, punctures arranged in rows, larger and closer at the sides, shallow, round, and variolate ; the surface is also minutely and irregularly creased, minutely granulose, minutely undulated, and, at the sides, covered with minute elevated points ; shining. Under surface of the abdomen minutely punctate, very closely so on the last segment ; prosternum coarsely punctured. Legs rather long; first joint of the posterior tarsi distinctlyshorter than the last, longer tlian the second and third together, the latter equal in length. Length (3.5 lum.
Arizona (IMorrison).
The mentum of this species is broadly rounded in front, with exception of a sinuation at the immediate apex, equal in length to one-
NORTH AMERICAN COLEOPTERA. 43 fourth its width at base, wliich is rather strong ; the exposed surface is strongly punctured and more distantly so than in either emarginatitm or piceum ; the terminal spurs of the anterior tibiae are arranged as in the former species.
E. carbonatlim n. sp. — Form moderately robust caiid convex, sides parallel ; body devoid of setae iu tlie middle, at the sides of the elytra there are a few widely scattered, robust hairs ; body black above, beneath the abdomen is nearly black, the anterior portions paler, legs, antennae, and mentum paler. Head much broader than long, punctures rather large, round, variolate, evenly distributed, separated by less than their own widths ; lateral sutures of epistoma distinct ; supra-orbital carinae well developed ; anterior margin broadly and extremely feebly emarginate, sides broadly rounded ; labrum rather feebly but distinctly emarginate, sides broadly rounded ; antennae moderate, second joint two-thirds as long as the third, third one-third longer than the fourth. Prothorax nearly twice as wide as long ; anterior margin very slightly shorter than the base, tlie latter nearly transverse, distinctly trisintiate, apex very feebly emarginate ; sides feebly and evenly arcuate throughout ; anterior and posterior angles acute and prominent ; disk distinctly margined anteriorly and posteriorly ; sides narrowlyreflexed,edgesacute:puncturesinthemiddleratherdeeplyimpressed and irregularly scattered, toward the sides becoming larger, more elongated, closer, more shallow, and scabrous. Scutellum very minute. Elytra at base very slightly wider than the contiguous pronotum ; sides parallel and almost exactly straight for three-fourths the length from near the humeri ; disk broadly convex, acutely rounded behind, more than three times as long as the pronotum ; punctures very small, shallow, round, variolate, arranged in very closely approximate rows, rather more distant in the rows than between them, near the suture the rows become somewhat broken up and irregular; the surface is minutely undulated, and near the suture the transverse creases are very indistinctly apparent ; it is not visibly granulated, shining. Under surface of abdomen finely punctate, punctures of the last segment nuicli more closely crowded, very dense ; presternum sparsely, coarsely, and evenly punctate. Legs moderate ; posterior tarsi shorter than the tibiae, first joint slightly longer than the fourth ; first joint of the anterior tarsi longer than the next two together. Last joint of maxillary palpi flattened and strongly securiform. Length S.O mm. ; width 2.8 mm. Arizona (Morrison).
The mentum is emarginate at apex ; the emargination is more acutely rounded at bottom than at the sides, is rather strong, and one-third as long as the width of the mentum at base ; the anterior angles are broadly rounded, the exposed surface is strongly and rather finely and closely punctate ; it is also rather feebly rugulose. Mandibles strongly and unequally notched at tips. The terminal spurs of the anterior tibiae are straight, strong, equal, and arranged as in emarginatiim.
44 TIIOS. L. CASEY.
E. scillptile 11. sp. — Form slender, nearly semi-cylindrical, sides parallel ; erect setae of elytra excessively short and sparse, scarcely visible ; Color of upper surface piceous-black, beneath very dark piceous-brown, nearly black, with a tinge of rufous ; legs and antennae just perceptibly paler. Head moderately convex, transversely and feebly impressed in front of the eyes ; anterior margin transverse, sides rounded ; punctures somewhat deeply impressed and scattered in the middle, closer elsewhere; supraorbital ridges distinct ; labrum squarely truncate in front, sides widely divergent posteriorly and nearly straight, anterior angles well developed ; antennae moderate, third joint much longer than the fourth. Prothorax three-fourths wider than long ; sides strongly and evenly arcuate ; apex distinctly shorter than the base ; apical and basal angles very acute and prominent ; apex feebly emarginate in the middle, nearly throughout its width, base distinctly trisinuate, nearly transverse ; disk very convex, distinctlymargined anteriorly and posteriorly ; sides narrowly retlexed, edges acute ; punctures small and impressed in the middle, larger, shallow, oval, somewhat confluent, and scabrous at the sides. Scutellum minute and transverso, angulate behind. Elytra at base slightly wider than the contiguous pronotum ; sides parallel and very feebly arcuate for two-thirds the length posteriorly ; disk very convex, acutely rounded behind ; punctures arranged in rows, rather distant, moderately large, very shallow, variolate, round ; there are also several elongated, striae-like impressions near the suture, and the surface is minutely, irregularly, and very distinctly creased, minutely undulated, and very minutely granulated ; sculpture more rough near the sides, which are very feebly reflexed. Under surface of the abdomen finely and nearly evenly punctate ; prosternum more coarsely punctate. First joint of the posterior tarsi scarcely longer than the next two together, distinctlyshorter than the last. Length 6.0 mm.; width 2.3 mm. Arizona (Morrison).
Tlie sculpture of tlie elytra is very composite and strongly developed. The nientum.is emarginate at apex through a length equal to about one-tiiird its width at base ; emargination most strongly rounded at the bottom, anterior angles well rounded ; exposed surface strongly puncfate and transversely rugulose. The prothorax is much more strongly arcuate at the sides and more convex than in pupayomini, which this species somewhat resembles ; it is more slender than that species.
E. flllbillin n. sp. — Form rather robust, sides parallel ; moderately convex ; lii'.ul anil prothorax glabrous, elytra having very sparse, robust, erect setae, which are more plentiful at the sides ; color piceous-black above and beneath, legs rufo-piceous, antennae and palpi same. Head much broader tiian long ; interocular surface moderately convex, moderately declivous in front of the eyes, transversely and feebly ridged just behind the anterior margin ; the latter broadly truncate, rounded at the sides ; punctures round, varying in size, evenly distributed, and distant their own widths ; between the eyes, near the anterior margin, the sculpture becomes very confluent and
NOKTII AMERICAN COLEOPTERA. 45 rough, punctures Vcariolate ; labrum very feebly emargiiiate anteriorly, sides broadly rounded, "fringe of setae very strong, setae fulvous ; supra-orlntal ridges acute and distinct ; antennae moderate in length, rather slender, third joint slightly longer than the fourth. Prothorax distinctly wider at base than at the vertex, where it is much wider than the head ; base generally arcuate, distinctly and strongly trisiniiate, apex very broadly aud feebly emarginate ; sides most strongly arcuate in front of tlie middle, slightly convergentposteriorly, feebly sinuate anteriorly; anterior angles very slightly rounded, posterior slightly obtuse, but not at all rounded ; prouotum marginedanteriorly and posteriorly, narrowly reflexed at the sides, edges acute ; disk moderately convex, rather finely and closely punctured in the middle, punctures becoming larger and closer toward the sides. Elytra at base slightly wider than the contiguous pronotum ; sides just perceptibly divergent posteriorly and nearly straight for three-fourths the length from the humeri, disk nearly three and one-half times as long as the pronotum, rather strongly convex, narrowly reflexed at the sides, somewhat acutely rounded behind ; rather strongly, closely, and minutely punctate in the middle, punctures much larger at the sides, in the middle they are slightly more distant in the rows than the distance between the latter ; the surface is, in addition, very feebly undulated, minutely and irregularly creased, minutely granulated, and, toward the sides, having numerous elevated points. Under surface of abdomen strongly convex, very finely punctate, very closely so on the last segment ; prosternum strongly and closely pitted. Legs rather long ; posterior tarsi as long as the tibiae, first joint as long as the fourth, longer than the second and third together, second longer than the third. Length 9.2 mm. ; width 3.5 mm. ; size very uniform. Arizona (Morrison).
The mentum is strongly and roundly emarginate at apex, through a distance equal to nearly one-third its width at base ; the exposed surface is strongly punctate posteriorly, and obliquely rugulose anteriorly. The spurs of the anterior tibiae are as in emarginatum. EMMEXASTUS.
E. Iiauillus n. sp. — Form robust, very convex. Entire body covered very sparsely with extremely short, semi-erect setae, which are almost invisible. Upper surface very dark piceous-brown, nearly black, legs and under surface much paler, piceo-rufous, the former slightly the paler, antennae still paler, piceo-rufous. Head much broader than long ; anterior margin transverse and straight, angles broadly rounded ; interocular surface rather convex, deeply, very closely, rather coarsely and roughly, though eveuly punctate ; eyes small, very feebly convex ; antennae as long as the width of prothorax, second joint two-thirds as long as the third and as long as the fourth, joints five to eight shorter, successively and feebly decreasing in length, last three joints strongly flattened, ninth and tenth broader than long, sub-triangular, eleventh slightly longer than wide, oval. Prothorax four-fifths wider than long ; anterior and posterior margins straight and transverse, the former about one-fifth shorter, slightly longer than the width
40 THOS. L. CASEY.
of head ; sides evenly and moderately arcuate throughout ; disk very convex, strongly and rather closely punctured, punctures very Evenly distributed, distant generally by nearly twice their own widths, deeply impressed. Scutellum very small, sides short and nearly parallel, broadly angulate behind. Elytra at base as wide as the pronotum ; sides parallel and rather strongly arcuate ; together acutely rounded behind ; disk about two and one-half times as long as the pronotum, very strongly convex and having tliree systems of sculpture combined : first, striae of small, deeply impressed punctures, with smaller impressed punctures scattered sparsely and without order over the intervals ; second, a very minute and even granulation over the entire surface; third, a system of very irregular, feebly impressed, and somewhat transversely arranged creases. Under surface of the abdomen irregularly and distantly punctate, punctures round and rather feebly impressed;prosternumfinelyandtransverselyrugnlose.Legsmoderate,femora flattened ; first joint of the posterior tarsi longer than the next two together, very slightly shorter, though more robust than tlie last joint. Length 4.6—5.6 mm.
San Diego, California.
This species seems to be rather abundant.
COMOXTIS.
C. elliptica n. sp. — Form moderately robust, sides parallel ; upper surface glabrous, with exception of a few excessively minute setae near the border of the elytra ; black throughout, elytra slightly more lustrous than the pronotiam. Head broader than long, sub-triangular, minutely and rather closely punctured, punctures increasing in density to within a short distance of the anterior margin ; epistoma broadly and evenly emarginate anteriorly, epistomatic suture distinct; labrum strongly emarginate in the middle anteriorly,lobesevenlyrounded;antennaethree-fourthsaslongasthepronotum, slender, filiform, second joint scarcely one-half as long as the third, joints four to ten sub-equal, shorter, last joint still shorter; mentum broadly and deeply emarginate. Prothorax at base two and three-fourths times, as wide as the head ; sides just perceptibly convergent and nearly straight for threefourths the length from the basal angles, then rather abruptly and strongly rounded to the apical angles ; apex broadly emarginate, base transverse, broadly and feebly sinuate toward the basal angles, the latter rather prominent and acutely rounded ; anterior angles acute, narrowly rounded ; disk two-thirds wider than long, strongly and evenly convex, minutely and distantly punctate, the jmnctures becoming very slightly closer toward the sides ; very minutely and conspicuously granulated ; pronotum narrowly rortexed at the sides, narrowly margined anteriorly, edges strongly rounded ; surface not margined jiosteriorly. Scutellum triangular, broader than long. Klytra as wide as the prothorax ; sides parallel and nearly straight for twothirds the length jmsteriorly ; disk very convex, acutely rounded behind, two and one-half times as long as the pronotum ; surface minutely rngulose or undulated, granulations rather indistinct, punctures minute, strong, evenly distributed, coarser, and more distant than those of the pronotum,
NORTH AMERICAN COLEOPTERA. 47 arranged without order ; near the suture a few indistinct transverse creases are visible ; sides narrowly reflexed, edges acute ; epipleurae narrow and continuous throughout the lengtli. Legs slender ; first joint of the posterior tarsi as long as the remaining ones combined. Length 12.0-14.0 mm. ; width 5.5-6.5 mm.
San Diego, California.
In some specimens, %, the sides are almost exactly parallel, while in the larger specimens, 9, the sides are just perceptibly divergent from near the apical pronotal angles to a point on the elytra two-thirds their length from the humeri. The males, though smaller, have a notably larger scutellum.
The differences between tliis species and robusta Horn are as follows : — In the former the sides of the pronotum for two-thirds the length from the posterior angles are feebly convergent, while in the latter they are generally slightly divergent. In the former the terminal spurs of the tibiae are more slender and the elytral sculpture is very much smoother. In the latter the form is very much more robust and slightly more depressed. In the former the head is relatively smaller and the sides of the elytra are more narrowly reflexed. There are also great differences in the length and sizes of the outer antennal joints. The comparisons have been made directly with Dr. Horn's type of rohusta which appears to be a somewhat rare species. E. arciiata n. sp. — Form robust ; body shining, very finely sculptured ; intense black throughout, glabrous. Head moderate in size ; sides nearly parallel to a point considerably beyond the eyes, then rapidly convergent and straight to the angles of the epistoma ; epistoma broadly and evenly emarginate, posterior suture distinct and strongly bisinuate ; interocular surface broadly and evenly convex ; between the eyes the punctures are very fine and irregularly scattered, gradually increasing in size and density anteriorly, on the epistoma they are very close and much larger ; labrum very roughly, closely, and deeply sculptured, narrowly and deeply emarginateanteriorly; mentum slightly wider than long, acutely and evenly rounded anteriorly, deeply bi-impressed on the exposed surface ; last joint of maxillarypalpi nearly as wide as long, strongly securiform, flattened, penultimate joint much smaller. Prothorax twice as long as the head, distinctly wider than the same anteriorly ; base one-fourth longer than the apex ; sides strongly and nearly evenly arcuate, most strongly so just in advance of the middle, very feebly and minutely sinuate just in advance of the posterior angles ; apex broadly emarginate, base very broadly and feebly arcuate, entire ; anterior angles acute, posterior obtuse, but not at all rounded ; disk as long as wide, moderately convex, minutely granulated, very sparsely and somewhat irregularly punctate, punctures very minute. Scutellum wider
48 TIIOS. L. CASEY.
than long, iinpunctate, and highly polished. Elytra at base as wide as the contiguous prunotum ; sides parallel for four-fifths the length from the humeri, evenly and very strongly arcuate ; disk very obtusely rounded behind when viewed vertically, t^ro and one-third times as long as the pronotnm ; snrface minutely and regularly creased, very minutely and strongly granulated, rather feebly and minutely punctate ; punctures arrangedin regular striae, with a single row of smaller punctures between. Under surface of tlie abdomen very sparsely and feebly punctate, except on the last segment, where they are deep, dense, and setigerous. Legs moderate ; tarsi short and robust, second and third joints of the posterior very feebly elongated. Length 13.5-15.0 mm. ; width at widest section, wliich is at the middle of the elytral suture as viewed vertically, G. 4-7.0 mm. Arizona ; two specimens ; differences scarcely noticeable. Regarding the elytral suture of this si)ccies as a line in space, its course is seen to be nearly straight to within a very short distance of the elytral apex as viewed vertically, where it is suddenly bent downward, so that at the immediate apex of the elytra, its course makes an angle perceptibly less than a right angle, with its direction at the scutellum. In no other species that I have seen is the sutural line so strongly and suddenly bent posteriorly ; there is no tendency to caudal prolongation.
This species is more closely allied to extricata Say than any other species in the catalogue, and differs in the following very important characters : — In extricata the intercoxal salient of the first ventral segment is about as wide as the intercoxal salient of the metasternum, while in arcuata the first is very much wider than the second, and is relatively much shorter.
In the former species the intercoxal process of the prosternum is very abruptly constricted posteriorly, into an elongated, narrow process, while in the latter it is very gradually and arcuately narrowed posteriorly.
In the former the second joint of the antennae is about one-fifth as long as the third, and is wider than long, while in the latter it is more than one-fourth as long as the third, and is nearly as long as wide. The elytral j)unctuation in the two species differs in (juality to a marked degree ; in extricata it consists of approximate rows of very approximate punctures, with more widely spaced punctures between the rows; in arcuata it consists of widely spaced rows of approximate punctures, with regular rows of much more distant [lunctures between them.
The form of body is quite different in the two species ; that above described greatly resembles coynata Ilald., if the type of tiie latter