37 testaceous. Head and pronotum, with the exception of lower posterior third, dark brown, the latter being light testaceous : wings testaceous, having most of the veins and cross veins black or dark brown, some of them heavier than others and giving the wings a slightly mottled appearance. Hind femora with indications of bands, especially on the inner face; the knees jDartly black, lower sulcus light testaceous : hind tibia, with the apical half reddish, basal half testaceous ; lower side of body, especially abdomen whitish, balance becoming brownish above.
Length of body : c? lO to 11 mm, ? 14 mm; pronotum, c? 2.50 to 2.50. ? 2.75; tegmina, d 10 mm, 9 13 mm; hind femora, cJ' 7 mm, + lOmm.
Fairly common during the month of December at Bahia Blanca. Not seen elsewhere, nor observed in any of the collections.
GENUS PLECTROTETTIX, McNEILL.
7'. jiicfu.s n. sp.
General color above dark brown, beneath white or light yellow; above varied with green and light testaceous. The posterior tibiae and under side of posterior femora bright carmine to purple, the hind femora with two oblique light bands on outer and inner faces, also a preai3ical annul us of same color, and rather broad, bright colored annulus at base of hind tibiae. The fastigium of the vertex blunt and gently sulcate above ; the lateral foveolae represented only by a few punctures forming an interrupted depression about twice as long as broad in the male ; in the female nearly obliterated ; frontal costa rather prominent and broad, gradually widening from a point immediately above the base of the antennae to the clypeus, little or not at all sulcate. Pronotum with the median carina percurrent, severed only by the last transverse groove, a little in advance of the middle. Lateral carinae of pronotum greenish or testaceous ; converging towards the middle where they are interrupted between the transverse sulci; sides of pronotum either green or light testaceous
38 with a medium dark spot: the posterior lobe deeply and coarsely pitted; the anterior lobes smooth; mesa and metapleura coarsely pitted with the sides gently compressed. There is also a dark streak extending from lower edge of eyes to outer marign of clypeus ; the latter and outer edges of mandibles carneous. Tegmina provided with a subcostal green stripe, the discal area more or less strongly mottled with alternate white or green and black markings basally but becoming general on the apical half of wing. Tegmina and wings extending beyond the tip of hind femora ; the latter comparatively heavy at the base, reaching slightly beyond the tip of abdomen in both sexes ; hind tibiae with from 9 to 11 spines in outer row^.
Length : of body d* 28 to 30 mm, ? 40 to 45 mm ; pronotum, d' 5 mm, ? 7. 5 mm ; tegmina, d 26 mm, + 31 to 38 mm; hind femora, d 18 mm, ? 22 to 27 mm.
This insect is quite numerous in the provinces of Cordoba and Sante Pe, in some localities being sufficiently plentiful to cause damage to garden and some field crops grown in low places where the vegetation becomes unusually rank. Specimens were seen in the collections of F. Schulz, H. Stempelmann, O. Thomas, and both the National and La Plata museums. A considerableseries of these insects was also taken at Carcarana and Rosario.
Fig. 13. — Plectrotettix plctus. male, tip of liind tibia and tDp of head and pronotiim.
GENUS EUPLETROTETTIX, N. G.
Body of medium size, slightly compressed ; tegmina and wings complete; posterior femora moderately robust at base.
3i> reaching (female) or slightly surpassing the apex of abdomen (male). Inner lower spur of hind tibiae nearly or quite twice the length of the upper one. The tibiae with ten spines in outer row. Tegmina with a well developed intercallary vein. Fastigium of the vertex a little narrower than the shortest diameter of the eyes, the foveolae shallow, wdth a median carina running through it and continued ujjon the occiput to the front edge of prnontum ; the edges of foveola blunt and turning inwards and backwards at the upper apex of the eyes where they approach quite closely to the median carina, becoming dimmer upon the occiput, though present in the shape of rows of little tubercels almost to the front edge of the pronotum. Frontal costa prominent, rather broad above between the base of the antennae, becoming broader below, gently sulcate above the ocellus continuing to the clypens ; front rather prominent, somewhat rounded when viewed from the side. Prothorax as in Plectrotetti.v but with the lateral carinae less prominently converging towards the middle and continuous throughout, cut by the middle and last transverse sulci, the last sulcus about the middle. TABLE FOR SEPARATING THE SPECIES, A. Snniller species. General color luiiform ferrngiuous or light brown, the markings inconspicuous and irregular, b. Lateral carina- of jjronotum (piite prominent, but gently converging near the mitldle. Mottlings of tegmina confined chietly to flisk. " ferriig'iueus Bruner.
bb. Lateral carina' of pronotum feeble on anterior lobe, considerably converging near the middle. Mottlings of tegmina (|uite generally distributed. " cou.sper.sus Bruner.
AA. Larger species. General color testaceous or green, the markings quite conspicuous and regular.
h. Disk of jn'onotum more or less plainly marked with black along inner edge of the well-developed lateral carin;c. Tegmina with a row of discal spots. General color testaceous, streaked with brown. S<*liulzi Bruner.
bb. Disk of pronotum not plainly marked witli black lines along inner edge of lateral carina-. Tegmina with dark markings not contined to disk. (Jeneral color green or greenish yellow. prasiuus Bi-imer.
Ell j )/<'ctrof('tf i.r fc r I- u (/ i nc 1/ s n. sp. General color ferruginous, mtirked with lines and dots of dark brown and black. Hind tibiae red, tip of spines black.
40 Antennae with the basal joints depressed becoming fihform apically, about as long as the head and pronotum combined. Vertex slightly acute-angled and extending in front of the eyes nearly (male), or quite (female), as far as the distance between them. Head wdien viewed from above about as wide as front edge of prothorax ; the disk of latter somewhat narrower in front than behind: the lateral carinae of male and female nearly as j^rominent as the median. Tegmina of male, with costal edge hyaline and more or less regularly veined with diagonal cross veins, this area slightly expanded; a median row of small subquadrate black spots: in the female the dorsal edge is also more or less mottled with small dark brown flecks, a few of which are also scattered upon the apical third of wing. Sides of pronotum and body, together with the hind thighs along their carinae flecked with black: there are also dim indications alongupper margin on latter of three dusky and three light bands : lower sulcus of femora, and hind tibiae bright coral red, the latter pale towards the base: knee and basal jDortion of tibiae black : venter yellow.
Length: of body, rf 12 to 1^ mm, 9 21 mm: of pronotum, c? 3mm, ¥ 3.75 mm: of tegmina, cJ'14 mm, 9 1(5 mm: of hind femora, d 10 mm, 9 12 mm.
This insect is fairly common on the sandy knolls about Asuncion, Paraguay, and the more elevated regions of the territory of Formosa across the river to the west. Eaplevti-otetti.r conspersK-'^ n. sp.
In structure and size very similar to the preceding, but with the markings more scattered over the whole insect. Ground color dull testaceous. Head slightly broader than front edge of i^rothorax, the latter with the lateral carinae on the front lobe rather dim and considerably convergent toward the middle, cut by the last transverse sulcus about the middle : posterior edge a little more than a right angle : the sides of head provided with several parallel transverse carinae ; entire surface more or less regularly and coarsel}" punctate. Posterior femora with indications of oblique
41 dusky bands on outer face and three on uj^per edge which pass to the inner face : the lower sulcus dull testaceous ; hind tibiae carneous or dull liesh color towards apex, becoming lighter towards the base ; knee and apex of hind femora as in the preceding sj^ecies.
Length (female): of body :^1 mm, of pronotnm 4 mm, of tegmina 1H.5 mm, of hind femora 11 mm.
Found upon the eastern slopes of the Andes at Mendoza, January L^7th.
Fig. 14. — Eaphctrotettix conspersnti — female Eiiph'cfrofeftir Schn/zi n. sp.
The body compressed, rather deep at mesothorax : occiput short, sam« width as front edge of prothorax, the latter slightly compressed from the sides; the lateral carinae nearly as prominent as median in the male, parallel to last transverse sulcus, from this point backward slightly divergent : in the female converging to a little in front of last transverse sulcus: j)osterior angle very obtuse; the hind portion provided on sides with irregular transverse ridges. Posterior femora extending slightly beyond the tip of abdomen in both sexes. Tegmina widest a little beyond the middle. Color variable, the general ground color being light testaceous to brownish ferruginous, more or less regularly streaked above and on the sides with black, the posterior femora showing three well-detined dusky oblique bands on outer face and across the upper margin, and internally. Tegmina with a subcostal line of white or green, obliterated in some specimens ; the discal field provided with rathm* large regular dusky spots, these markings continuing almost to the apex of the wing ; the upper and lower edges usually more or less free from markings, though in some specimens where the disk of the pronotum is marked along the inner
42 edge of lateral carinae with black this same color extends upon the dorsal angle of tegmina. Face below the eyes usually furnished with a well-defined black streak. Sides of pronotum with the usual tryxaline light and dark streaks. Hind tibiae varying from dull red to bright red, with a pale basal annulus : knees and ajDex of femora as in the preceding forms.
Length: of body, d^ 15 mm, ? 23 mm; of pronotum, d^ 3.25 mm, ? 4.5 mm ; of tegmina, d' 14 mm, ? 18 to 20 mm; of hind femora, d 10.5 mm, ? 13 to 14 mm.
Very common in the vicinity of Cordoba where it may be found during the winter months among the dead bunch grass growing on the sandy ujjland. Prom the collection of F. Schulz.
Euplectrotettix prasinus n. sp.
This is a somewhat larger, more robust insect than any of the preceding, in which the head is somewhat broader than the front edge of pronotum. The latter with the middle carina considerably the strongest, the lateral ones gently converging in front of the middle from w^hich point they diverge both anteriorly and posteriorly ; the hind edge somewhat more than a right angle; the sides and head quite smooth, the punctulation being feeble. General color of head and thorax dull apple green ; tegmina, base of abdomen, and legs dull testaceous; the tegmina with indication of discal spots. Hind femora showing traces of dusky and light bands; hind tibiae red; lower sulcus of femora yellow; knees black; venter yellow.
Length (female) : of body, 30 mm, of pronotam 5.5 mm. of tegmina 21 mm, of hind femora 15 mm. Cordoba in January, where it is found in rank grass ; not plentiful. SUB-FAMILY OEDIPODINAE.
In some parts of the Nortb American continent this subfamily becomes very numerous in genera and species but it seems to be represented in Argentina by less than a dozen species. None of these insects are of any special importance
43 from the economic .standpoint but the various species of Bufonacris become interesting- on account of their peculiar obese structure and wingless bodies. These insects are found in the arid and sub-arid regions southward. The forms of this sub-family may be recognized by the following : TABLE FOR THE SEPARATION OF THE GENERA.
A Flxtenial margin of posterior tibia' without the apical spine. b. Posterior tibia' terete, the lateral margins rounded, the apical spurs compressed so that they are narrower than deep at base, c. Body apterous. Pronotum behind straight or gently emarginate. d. Head perpendicular, the frontal costa irregular, dilated at the ocellus, not sulcate. Body tuberculate.
e. Antenna' slender, moderatelj^ long, somewhat tlatteued. Head tumid. PAPIPAPPUS Sau.ssure.
ee. Antenna' short, moderately heavy and apical ly somewhat clavate. Head not tumitl. PAPPUS Saussure. dd. Head more or less declivant, the vertex angulate: frontal costa straight, sulcate. Protonum costulate.
PH K YNOTE TTIX Saussure.
cc. Body winged; the hind ]iair with a transverse duskv l)and. Pronotum angulate behind. TKIM.EROTKOP1S Stal. l)b. Posterior til:)ia' more or less flattened apically, the edges acute, the apical spurs depressed so thai thev arc l^roader than deep at base: Winged. "C<KLOPTEKXA Stal.
AA. External margin of posterior lil)i:c jjrovided with an apical s])ine. Body strongly depressed, apterus. Pronotum with the posterior margin not produced: the mesonotum uncovered. Posterior til)ia' many-.spined. BUFOXACKIS Walker.
GENUS PAPIPAPPUS, SAUSSURE.
F. cldrdxidiiNs Sauss. This odd looking insect was described by Dr. H. de Saussure from specimens collected by G. Claraz between the rivers Rio-Negro and Rio-Chubut. No specimens have been examined by the writer. GENUS PAPPUS, SAUSSURE.
P. iKifdi/omis Sauss. Prodrom OEdi^Dod, p. iOU. (Rio- Negro, G. Claraz).
GENUS PHRYNOTETTIX, SAUSSURE.
A single female specimen of an insect now in my possession that was collected along witli live others by some member of the U. S. Fish Connnission steamer Albatross staff on the Straits of Magellan, is referred to this genus. It
44 seems to be distinct from both the P/injnotetti.r noia Sauss. and P. peruviana Sauss. — the former from Chile and the latter, as the name would indicate, from Peru.
PI I r II not et fix JIaf/elltniicus n. sp. Rather robust, comparatively small (15 mm in leng-i;h), apterous ; greenish testaceous with indications along lateral carinae, thorax, sides of back, and middle of sides of abdomen of dark brown or black lines.
Fastigium of vertex somewhat acute angled, considerably projecting in front of the eyes. The lateral foveolae large, deep, about one-half longer than wide. Frontal costa very narrow above, gradually widening below, sulcate throughout, and reaching clypeus. Antennae about fifteen-jointed, the joints flattened, about as long as head and two-thirds of i^ronotum; the latter short, truncate in front, slightly emarginate behind, about reaching front edge of metathorax. The median carina quite heavy, continuous throughout and not cut by transverse sulci. The lateral carinae converging towards middle and again expanding posteriorily, a little closer together at the hind edge of pronotum than in front. The thorax and abdominal segments with a mediodorsal carina throughout : also provided with sujiplimentary carinae in continuaiton of the lateral ones of ])ronotum. In addition to these there is also a faint indication of another carina on middle of lateral lobes of pronotum which is also continuous upon the side of abdomen, below" wdiich is a black line. Posterior femora moderately slender, the hind tibiae with ten sj^ines in outer row. Foveolae of vertex with median lonsitudinal carina continued upon occiput.
Length : of body 15 mm, of pronotum 3 mm, of hind femora H mm.
GENUS TRIMEROTROPIS, STAL.
T. pal/iiJiiicniiis Burm. This insect is represented in all of the collections examined by me. There are si^ecimens from Cordoba (Schulz); Rosario (Stempelmann) ; Carcarana (O.