Bruner: South American A < i ■ >ea. Id'.* 



[53. Abracris chapadensis (Bruner). 

 Otnalotettix 1 hapadertsis Bri mk. Biol. Cent. Amer. Orthopt., [I, pp. 280, 282 (1908). 



In size and general form similar to A. meridionalis, but readily 

 separable from it by the complete absence of tin oblique obscure 

 bands on the outer face of the hind femora and by the uniformly 

 cinereous hind tibiae, which show a close- relationship of chapadensis 

 to nebulosi ileipennis, and conspersipennis. In the presenl 



species the cerci of the male arc longer and slenderer than usual, 

 and, instead of being forked, have the apex slightly expanded and 

 Battened. The lasl ventral segment of ihe abdomen of the male is 

 small, short, and comparatively blunt, being nearly equalled by the 

 supra-anal plate and quite reached by the cerci. 



Head of moderate size, as \\ ide as the anterior edge of the pronotum; 

 viewed laterally considerably elevated above the pronotum; eyes 

 prominent, as wide above as below, separated by a very narrow sulcate 

 vertex scarcely as wide as the diameter of the slender antennal joint; 

 fastigium somewhat depressed, about as long as wide, very gently 

 sulcate anteriorly, the margins provided with a well-defined carina; 

 lateral ocelli large, occupying more than half the space between the 

 eyes and the upper, lateral edges of frontal costa. Latter prominent 

 and widest above between the antenna', and, when viewed in profile, 

 somewhat roundly produced anteriorly; above the ocellus coarsely 

 punctulate, plane, below the ocellus narrowed and sulcate, continuous 

 to the clypeus. Facial carina: prominent, nearly straight, and but 

 gently divergent below. Antenna? fairly robust, in the male about 

 one-fourth longer than the head and pronotum combined. Pronotum 

 subcylindrical in advance of the principal sulcus, expanding gently 

 on the posterior lobe; the anterior edge emarginate, posterior edge 

 widely and roundly angulate, the surface of disk and sides of hind 

 lobe closely and confiuently punctulate. Tegmina with the edges 

 nearly parallel, extending beyond the tip of the abdomen about one- 

 fourth their length, rather closely and strongly veined. Hind femora, 

 normal, a little surpass*ng the apex of abdomen. The latter evenly 

 tapering, the last ventral segment small, short, and comparatively 

 blunt; supra-anal plate elongate-triangular, the sides gently arcuate, 

 with the middle elevated and widely and deeply sulcate, the sulcation 

 slightly constricted midway from the base towards the apex. Cerci 

 as described above. Mesosternal lobes separated 1>\ a subquadrate 



