48 Annals of the Carnegie Museum. 



As indicated on page 479 of volume VIII of these Annals, the 

 insects which comprise the genus Stenacris are quite similar in their 

 general appearance to those referred above to Opsomala Serville. In 

 the representatives of Stenacris "the last ventral segment of the male 

 abdomen is quite complex in structure, and varies very distinctly 

 among the difi'ereut species," while in Opsomala it varies but little. 

 About a dozen species have already been described and now four 

 more are recognized and herewith described. 



90. Stenacris vitreipennis (Marschall)? 



Gryllus vitreipennis Marschall, Ann. Wien. Mus., I, pp. 214-215, pi. 18, fig. 6 



(1836). 

 Stenacris chlorizans Walker, Cat. Dermapt. Salt. Brit. Mus., IV, pp. 652, 653 



(1870); KiRBY, I. c, p. 413 (1910). For fuller synonymy see the last reference. 



There are two females of a locust belonging to this genus at hand. 

 They come from the Isle of Pines, where they were collected at Nueva 

 Gerona in June, 1912. They are placed here, because there can be 

 but little doubt that they are the same species as the insect well-known 

 from the southeastern portions of the United States. 



91. Stenacris cylindrodes (Stal). 



Opsomala cylindrodes !5t.\l, Kong. Svensk. Frcg. Eugen. Resa., Ins., p. 325 (i860). 



Arnilia cylindrodes Stal, Recens. Orth., I, p. 85 (1873). 



Stenacris cylindrodes Rehn, Proc. U. S. Nat. Mus., XXXVI, pp. 135, 136 (1909). 



The present species does not seem to be represented in the material 

 now at hand, although it has been reported from the adjoining regions 

 of Brazil and Paraguay. Judging from the experience of the present 

 writer cylindrodes is confined chiefly to the coastal regions of Brazil, 

 with Rio Janeiro as the type-localit}'. The specimens of this species 

 heretofore reported from Paraguayan and interior Brazilian localities 

 may have been one or the other of the two following, or even a distinct 

 and allied form. 



92. Stenacris interior (Bruner). 



Arnilia interior Bruner, Biol. Cent.-Amer., Orth., II, p. 254 (1908). 

 Opsomala interior Kirby, Syn. Cat. Orth., Ill, p. 419 (1910); Bruner, Ann. 

 Carnegie Mus., VIII, pp. 81 (191 1), 479 (1913). 



There are three males in the collections now receiving attention 

 which are apparently the same as the insect to which this name was 

 given, but as the type is not at hand, I hesitate to give a more com- 



