Brunf.r : Sorni American Acridoidea. 121 



( General color pale in the male to brunneo testaceous in the female. 

 In the male tin- occipul to lower edge ol eyes, the anterior border 

 togethei with the hind lobe of the pronotum, an oblique patch on 

 each side in advance of the middle coxse, the basal half and apical 

 segments of the abdomen, and the knees and base of hind tibiae, 

 infuscated. Veins of wings widely testaceous on a black background. 

 I find tibiae cinereous, in the males with an olivaceous and in the females 

 a vinous tinge, the spines flavous with black tips. Antenna.' infus- 

 cated apically. 



Length of body, o 1 . 21.5 mm., 9. 27 mm.; of pronotum, cf, 4.1 

 mm., 9 . 5.1 mm.; of tegmina. cT. 4o 111111., 9 , 5 mm.; of hind femora, 

 cf, 13.5 mm., 9. 16.25 mni.; of antennae, c?\ 14 mm., 9, 12 mm. 



Habitat. — Para. Brazil, in -April where they were taken by H. H. 

 Smith. Types in the Carnegie Museum. 



( lenus Sttai ces Stal. 



Sitalces Stal, Bihang. Svensk. Akad, Handl., V, no. 9, p. 16 (1878). 



The present genus is composed of small to medium-sized apterous, 

 or subapterous, locusts of modest appearance. The several known or 

 recognized species belong to tropical America, where they may be 

 fou nd among the herbaceous plants in and about the margins of forests. 

 Mosl of the described species have been separated in a synoptical 

 key published by the present writer (Biol. Cent.-Amer., Orthopt.. 

 II. p. 291, April.. 1908). An additional species was also described by 

 me recently from Peru (Horae Soc. Ent. Rossicae, XXXIX, p. 485, 



[910). 



168. Sitalces robustus Bruner. 



Sitalces robustus Bruner, MS. Biol. Cent.-Amer., Orthopt., IT, p. 291 (1908). 



Apparently most closely related to volxemi Stal, from which it 

 differs most notably in the somewhat larger size, the brownish-olive 

 instead of olive-green color, and in having the median pronotal carina 

 well developed, instead of having it subobsolete. Outer margin of 

 hind tibiae eight-spined. 



Eyes large and prominent, about one and one-half times as long as 

 iIm anterior edge of the cheeks; very narrowly separated at the vertex, 

 the interspace being slightly less than (cf ) or iust about the same as 

 (9 ) the diameter of the antenna?. Vertex depressed, the fastigium of 

 moderate size, a little broader than long, rounded in front and bordered 

 by a slight raised carina, the disk somewhat rugose and punctulate 



