29 DidiroiiiorplKi vli'idix found so abundantly throughout the United States and portions of Mexico. The following description is therefore ajjpended :
Antennae rather short with the joints somewhat depressed basally; fastigium of the vertex projecting in advance of the eyes about half their lesser diameter ; the frontal costa gently sulcate from between antennae to clypeus ; lateral carinae of face not prominent, sinuate, and diverging to corners of face ; eyes small, rounded behind, nearly straight in front and somewnat acuminate above; loveolae of vertex but gently sulcate. Pronotum very gently comjDressed on the sides, the lateral lobes slightly bulging; the three carinae distinct, the lateral ones gently diverging from anterior margin to the posterior : last transverse incision a little behind the middle, jDOsterior edge partly angulate; tegmina and wings va.rying in length from two-thirds that of the abdomen to considerably surpassing it, their apex rounded. Posterior femora moderately heavy, comparatively short, and but little surpassing the tip of abdomen. General color either green or dull wood brown, with indications of a slight dusky band on sides of head, back of eyes and upper portion of lateral lobes of pronotum; also a slight blackish line on upper edge of knees of hind femora. There is also an indication of dusky markings at the sides of basal segments of abdomen and meso-and metathorax. Length: of body (female) 2o mm; antennae 5mm; of pronotum 4 mm; of tegmina lU to 15 mm; of posterior femora 10.5 to 11 mm.
This insect is rather rare in the vicinity of Carcarana and Roldan where it occurs along railroad tracks and in the vicinity of cultivated or disturbed ground in a similar manner to that of our North American form. Sjiecimens were also seen from Rosario, Santa Fe.
Dr. Giglio-Tos in his report on the Orthoptera of the Bolivian Chaco and of the Rei^ublic of Argentina mentions having taken sj:)ecimens of D. virklix Scudd. at San Lorenzo in the province of Jujuy. Whether or not they were of the same sj^ecies as the present I cannot say.
30 GENUS TOXOPTERUS, BOLIVAR.
If this genus of the Tryxalinae occurs at all within the confines of Argentina it will be near the Bolivian frontier. It has been included in the table of genera on account of the similarity in color between Toxopteni^ nuDiatns Bolivar and a new^ form from several localities in Cordoba and Santa Fe.
GENUS FENESTRA, BRUNNER.
TABLE FOR SEPARATION OF THE SPECIES.
A. Sides of pronotum gently diverging posteriorily in both sexes: the median carina dusky, head not espeeiallj' large, no wider than front edge of pronotnm.
b. Larger. Anterior field of male wings very broadly fenestrate: the posterior field colored throughout pulchripeiiuis Bruner. bb. Smaller. Anterior field of male wings narrowly fenestrate: the posterior field colored on basal half. intermedia Bruner. AA. Sides of pronotum parallel in male at least, the median carina of same color as disk. Head comi)aratively lai'ge, a little wider than front edge of pronotum. W.ngs hyaline. argentina Bruner.
F. 'pulenripennis, n. sp.
Body slender; general color dull brownish testaceous varied with green; antennae in male subensiform, in female strongly ensiform; lateral carinae of pronotum straight, slightly diverging posteriorly in both sexes; the median carina dark browni or black; dorsal portion of head, pronotum and folded wangs varying from brown to green in female, brown in male ; sides of j^ronotum and head with body browaiish testaceous in female, green becoming mixed with brown on cheeks and metathorax in male ; front margin of tegmina in both sexes broadly marked with green ; immediately back of this is a rather broad dark stripe more or less interrupted by the heavy white cross-veins found in this particular region ; balance of wing browm; hind wings with the basal portion bright vermillion, becoming more dilute tow^ards ai3ex ; anterior field broadly fenestrate, the cross-veins on basal portion being angled and directed towards the apex of wing anteriorl3^
Length of body : d 24 to 25 mm, ¥ 30 to 32 mm : pronotmii, d' 4.5 to 4.75 mm, ¥ 5.5 to 6 mm; tegmina, d and 9 22 mm: hind femora, c? 15 mm, ? 18 mm.
Found on the open camp early in December among dry and dead grasses. A very active insect and difficult to capture. When flying the males are exceedingly noisy. F. intermedia n. sp.
A slender species with the sides of pronotum gently expanding towards the posterior edge : head rather small, the ai3ex of tegmina gently exjianded and rounded: antennae in male flattened at base, in the female dagger- like. General color of male brownish testaceous, of female green : median carina testaceous to brown : base of hind wings deep rose color ; anterior portion fenestrate but less broadly so than in pKlchripennis. The transverse veins in this portion of the wing less numerous than in the other species — about nine in number.
Length of body : <^ 20 mm; 9 28 mm; of tegmina, cf 16 mm, 9 20 mm; of hind femora, d 12 mm, 9 IH mm. The numerous specimens examined were collected on the l^ampas in the vicinity of Carcarana, P. C. C. A. F. cdr/entina n. sp.
A rather small but comparatively robust species in which the lateral carinae of the pronotum are parallel. The wing covers are but little broadened towards the apex. General color yellowish testaceous; pronotum with the lateral carinae yellow brodered within by rather broad black lines ; the anterior edge of front wings green, the disk smoky brown, more or less transparent in the center, the dorsal portion with a faint tinge of greenish ; hind wings with the basal posterior portion faintly cinnabar red. Length of body 21.5 mm; of tegmina 15 mm; hind femora 14.5 mm. A single male from Carcarana, P.O. C. A. GENUS SINIPTA, STAL.
S. B((hti<nii Stal. A very common locust in dry localities -where the grasses are inclined to grow in bunches. One of
?,-^ the species that winters over as adults. Cordoba (F. Schulz, H. Stempehnann); Carcarana. (O. Thomas.)
\ Fig. 8. — Sinipta Daluiani, female, and top of head and pronotuin. GENUS AMBLYTROPIDIA, STAL.
A. ferruf/ino.sd Stal. This locust occurs in small numbers from Buenos Aires northward. Specimens are contained in the collections of F. Schulz, H. Stempehnann and O. Thomas. It was also reported by Gigiio-Tos. GENUS DICHROATETTIX, N. G.
Specimens of a rather small bat comparatively robust locust related to the genus Steiiobof/n-ns were found in considerable numbers over portions of the provinces of Santa Fe and Cordoba. These apparently belong to an undescribed genus which might be characterized as follows : Fastigium of the vertex rather broad with the margins slightly raised ; the lateral foveolae only faintly indicated, linear and visible from above ; the vertex above with a percurrent longitudinal carina. Antennae with the joints flattened, slightly constricted in the middle, expanded at the base and towards the apex, in the female about as long as head and pronotum combined, in the male half as long again, in the latter curled toward apex. Frontal costa rather broad, not very prominent and gently sulcate from the antennae to clypeus. Pronotum with the front edge straight ; the lateral carinae converging towards the middle, the hind edge a right angle or more, transverse groove about the middle. Tegmina complete, nearly or quite reaching the tip of the hind femora ; costal area of wings in male somewhat broadened indicating that the insect might be a noisy one. Hind wings with basal portion red, apex infuscated, the males dusky, females greenish.
33 D. vhi(lifj-(nis n. 823.
The beautiful ai^ple-gTeen face, along with its white labial and maxillary palpi, will at once distino-uish this species from any possible other forms of Argentine locusts. Antennae ferruginous above, black or dark brown below\ Male with occiput dark testaceous inclining to brown and provided Mith two diverging darker colored lines which reach the front edge of the j^ronotum : the latter Avith <C-njl--^AeH]tWMH..
-JKt^^ Fiy. 9 — Dichroatettix viridifrons, fcuialt". Fia;. 10. — D. v ridifrons, male. the disk more or less intensely blackened toward the rear ; the sides somewhat varigated with light and dark oblique bands which point from the lateral carinae in the rear towards the front. Tegmina brownish with black obscure mottlings along discal area and aj^ical portion. Lower and inner sides of hind femora and hind tibiae in male blackish, except a preapical annulus on femora and a post-basal one on tibiae; posterior tarsi somewhat paler; in female, lower edges only of hind femora blackish, outer, upj^er, and inner faces greenish. Upper portion of abdomen yellowish with an orange brown tint.
Length of body: d 1^ mm, V i'4 to 'l\^ mm; ])ronotum, d^ 4mm, ? 5.5 mm; tegmina, d 14 to 15 mm, '+ 17 to 18 mm; hind femora, d 12.5 mm, + 15 mm.
Cordoba (F. Schulz) ; Carcarana (O. Thomas). GENUS STAURORHECTUS, GIGLIO-TOS.
St. lojigicoriiis Giglio-Tos. San Lorenzo, Tala (Giglio-Tos) Cordoba (P. Schulz, H. Stemi)elmann. ) GENUS STIRAPLEURA, SCUDDER.
This genus is represented in Argentina, so far as the material before me would indicate, by at least four distinct
34 species none of which seem to have been decribecl. They occur upon the ojDen camp from Cordoba and Santa Pe southward at least to Bahia Blanca, being among the commoner grasshoppers.
TABLE FOR SP:PARAT1NG THE SPECIES.
A. Largei". Tegmina with a distinct, narrow, light-colored subcostal stripe, b. General color above reddish brown, more or less marked with black and dark brown. Pronotum with the disk dark and the lateral c irinti? light. sig'iiatipenuis Bruner.
bb. General color above dull testaceous without distinct mottlings or other marks. Pronotum with the disk unadorned; the upper edges of sides blackish. pallida Bruner.
AA. Smaller. Tegmina not provided with an especially distinct, narrow, light-colored subcostal stripe, b. Whole insect above more or less varied by lines of green, brown or testaceous and conspicuously marked with black and white. variabili-s Bruner.
bb. Whole insect above quite evenly dull brownish, the raai'kings inconspicuoiTS. obscura Bruner.
S. HignaUpennis n. sp.
The larger of the four species belonging to this genus in which the general color above is reddish brown, more or less marked with black or dark brown ; fastigium of the vertex but gently depressed, the lateral foveolae well marked, twice as long as broad : j^ronotum with the median carinae qiute prominent the lateral ones being obliterated with the exception of in front and towards the rear where they appear as whitish raised ridges : tegmina and wings extending slightly beyond the tip of the abdomen in both sexes, as do also the hind femora; the latter comparatively robust; basal tegmina with a subcostal white line, the median area provided with a row of rather large subquadrate dusky spots ; other spots of same color also scattered upon the dorsal, apical, and costal areas of wing ; posterior femora with the knees above black, indications of dusky bands on upper edge of exterior and interior faces, also sulcus ; hind tibiae pale purple.
Length of body: cf 17mm, 9 22 mm; pronotum, d" 3.5 mm, + 4 to 4.25 mm; tegmina, c? 12.5 mm, ? 16 mm; hind femora, c? 10 mm, 9 13 mm.
This insect seems to De quite var tioie oorli m size and color and is distributed over a considerable portion of the Republic from the Pampa Ceatral and extending into Ura.o'uay to the eastward. Whether or not it will prove to be the insect decsribed by Blanchard as Oe(Ji[)od(( sif/ndfipejniis I cannot say since I have not access to his description. ,^ Dr. ^Berg- of the National Museum in Buenos Aires has written an article for the Stettiner Entomologische Zeitschrift in which he mentions certain Orthojitera from the Pamapa Central one of which he doubtfully refers to Stoiobothrus .sU/iKtt/peiniis, and for this reason I am not quite certain but that he refers to the j^resent insect. Fig. 11. — Stirapleura pallida, female.
*V. iMiUida n. sj).
This insect may be distinguished from the others by the absensce of markings upon the disk of the pronotum and dorsal edges of the head and tegmina, and by having the lateral lobes of the pronotum banded with black. General color testaceous or dead grass brown, with the sides of head, back of eyes, and lateral lobes of pronotum marked by a broad dark line in the center of which is a narrower one of the general body color. The tegmina are provided with a subcostal greenish white line, and the disk with a longitudinal series of quadrate dusky spots. Hind femora with indications on the upper edge of dusky bands, below more or less tinted with red ; hind tibiae reddish. Length: of body, average, c^ 15 mm, + 1*0 mm; pronotum, c? 3 mm, + 3.8") mm; tegmina,, c? 11.") mm, 9 15mm; hind femora, d" 10 mm, 9 13.5mm.
Carcarana, F. C. C. A. (O. Thomas) ; and other portions of Santa Fe and Buenos Aires provinces.
36 S. variahiUs n. sj^.
A rather small though compact species in which the body is more or less varied by lines of green, brown or testaceous and marked with black and white. General color of male brownish testaceous, of female greenish. The face in the male testaceous, in the female green; toj) of head (male) with a rather broad central testaceous line bordered on each side by an equally broad black band which is extended upon the disk of i3ronotum taking in the lateral carinae and extending as a narrow dagger-like stripe upon the dorsal por- Fig. 12. — Stirapleura variabilis— female.
tion of the tegmina : the lateral carinae whitish : there is a rather heavy raised line on lateral side of i^ronotum which is white in both sexes, female with slight indications of black line bordering the eyes above and the white carinae of pronotum otherwise obliterated. Wings with a discal field provided with from four to five rather large blackish spots separated by the general color of wing. Hind femora showing indications of oblique dusky bands ; knees also dusky : posterior tibiae with the basal portion whitish testaceous, becoming duksy toward the middle, from which point to the ai^ex they are reddish ; feet whitish, lower surface light testaceous.
Length of body : d 10.5 mm, 9 17 to 18 mm: pronotum, d 2 mm, 9 8.25 mm; tegmina, c? 8 mm, ? 12nnn: hind femora, d" 7 mm, ? 10.5 mm.
Bahia Blanca and Pampa Central, where it is rather abundant on dry camp. Not observed in the collections examined.
S. obsci/ra n. sp.
A medium sized si3ecies in which the general color is dark brown, more or less variegated or mottled with light