Bruner: South Amerii \\ Acru ea. L29 



178. Atrachelacris unicolor Giglio I 



Atrachelacris unicolor GiGLlO-Tos, Boll. Mus. Zool. Anat. Comp. Torino, IX, no. 

 1 s I. p. j i (,1804). 



Habitat. Paraguay and northern Argentina. Not represented in 

 the II. II. Smith collection made in southwestern Brazil. 



179. Atrachelacris gramineus sp. nov. 



Very similar to A. unicolor Giglio-Tos in general appearance, but 

 larger, more robust, and of a yellowish instead of olive-green color. 

 Si rongly hirsute I hroughoul . 



Head rather small, plainly narrower than the front edge of the 

 pronotum, into which it is sel almost to the eyes. Latter very little 

 (o") or not any (9) longer than the anterior margin of the cheeks, 

 separated above by a space a very little greater than the widest portion 

 of the frontal costa. the fastigium depressed and very broadly and 

 shallowly silicate, most apparently so in the male, where this area is 

 plainly bounded by lateral carina?, which are continuous with the 

 sides of the costa; the latter moderately prominent, broad, and con- 

 tinuous to the clypeus, widest just above the ocellus, sulcate through- 

 out, but most profoundly so below the ocellus; antennae somewhat 

 exceeding the combined length of the head and pronotum. Pronotum 

 -1 r< »ngly divergent caudad, its surface irregularly longitudinally rugose, 

 the ruga? inconspicuous., except when viewed with a magnifier, the 

 hind lobe slightly longest; hind margin obtusangulate, the immediate 

 apex rounded. Tegmina sparsely veined, the basal third coriaceous, 

 remainder more or less membranous. Hind femora robust and coarse, 

 the carinas prominent, very prominently hirsute; anterior and middle 

 femora of male not greatly enlarged; hind tibia? eight- to nine-spined 

 externally, heavy. Tip of male abdomen as in unicolor, but the 

 cerci less robust at base and quite strongly incurved apically; last 

 ventral segment noticeably longer, and with its apex more acuminate 

 than in the type species. 



General color pale yellowish green on head, pronotum, tegmina, 

 pleura, hind femora above and externally, and tibiae; sides of abdomen, 

 venter, lower edges and inner face of hind femora, and pectus greenish 

 pale flavous. Antenna? flavous, sometimes with a rufous tinge apically. 

 Lu miles of hind femora tinged with rufous. Tibial and tarsal claws, 

 -pines of hind tibia?, and tips of valves of ovipositor, black; eyes 

 wax-vellow. 



