Bruner: South American Acri \. Ill 



196. Osmilia violacea (Thunbei 



Gryllus violaceus Thunbj rg, Mem. Acad. PStersb., IX, pp. 396, 413 1 1 



Acridium (.Osmilia) violacea StAl, Recens, Orthopt., I. p. 68 1 1- 



Osmilia violacea Giglio-Tos, Boll. Mms. Zool. Anat. Torino. IX. no. 184, p. is 



IS,; p. 



Habitat. — Numerous specimens of this species arc before me as I 

 write. They were taken at Para, Santarem, Corumba, Rio de 

 Janeiro, Chapada, and other Brazilian localities. The dates of 

 capture include the months of April to December inclusive (H. H. 

 Smith). 



Genus Rhytidochrota StAl. 



Rhytidochrota StAl, Recens, Orthopt., I, pp. 35, 54 (1873). 



197. Rhytidochrota laevifrons Stal. 



Rhytidochrota lavifrons Stal, Bihang, Svensk. Akad. Handl., V, no. 4, p. 78 (1878). 

 Habitat. — Two males and a single female, Para, Brazil, in April (H. 

 H. Smith). 



198. Rhytidochrota turgida Stal? 



Rhytidochrota turgida Stal, Recens. Orthopt., I, p. 54 (1873). 



Habitat. — A single female specimen from Para, Brazil, is referred 

 to this species with some hesitation. It, like the preceding, was col- 

 lected during the month of April by H. H. Smith. 



Genus Psiloscirtus gen. nov. 



There is still another of the numerous medium-sized apterous, or 

 subapterous, South American locusts at hand, which cannot be made 

 to fit any of the known genera. It is therefore my decision that 

 hereafter it shall be designated as Psiloscirtus olivaccus. The 

 present genus comes closest to Rhachicrcagra Rehn, but differs from 

 that insect in a number of respects. It also bears resemblance to 

 Rhytidochrota Stal, as may be seen by a reference to the following 

 diagnosis. 



Body sparsely hirsute throughout, apterous, very coarsely punc- 

 tulate and rugulose on head, thorax, and first abdominal segment. 

 Head of moderate size, the vertex very narrow, linearly sulcate, the 

 fastigium depressed, also longitudinally and narrowly sulcate, not 

 quite merging with the sulcation of the frontal costa. Latter rather 

 prominent between the antenna?, punctulate, fading below the ocellus. 

 Eyes large, prominent, their longest diameter nearly twice the length 

 of the front margin of the cheeks. Face somewhat oblique. An- 



