.NO. 1661. ON SOME BRAZILIAN GRASSHOPPERS— REIIN. 135 



These specimens have the fastio:iiim, as a rule, slightly smaller than 

 Paraguayan specimens, while the variation in the form of the same 

 is quite cimsiderable. 



Genus LEPTYSMINA Giglio-Tos. 



1894. Leptysmina Gigmo-Tos, Boll. Mus. Zool. Anat. ('oni]i. Torino, IX. No. 

 184, p. 34. 



Included Leptysmina pallida and rosea. Giglio-Tos, of whicli the 

 latter i.s here selected as the type. 



LEPTYSMINA ROSEA (Giglio-Tos). 



1894. L[epfysmina] rosea Giglio-Tos, Boll. Mus. Zool. Anat. ("oni]). Torino, IX, 

 No. 184, p. 34. [Buenos Ayi'es.] 



Corumba,MattoGross<), Brazil. March; lowland. (H.H.Smith.) 

 Five males. 



These specimens are perfectly typical of this species, which is now 

 known to range from Buenos Ayres to Corumba. 



In size the individuals in hand are very uniform. Specimens from 

 Carcaraha, Argentina, determined as this species by Bruner, are seen 

 on comparison with the descriptions and Corumba material to be the 

 allied Leptysmina pallida Giglio-Tos. The handiest index to the two 

 species, aside from the greater size of pallida, is the cliaracter of the 

 prosternal spine. 



Genus STENACRIS Walker. 



The species of Stenacris available for study may l)e separated by 

 the following key: 



a. Subgenital plate of the male with either an erect dorsal median lobe or with the 

 margin supplied with lateral acute processes or both. 

 h. Subgenital plate of the male with a median dorsal lobation. 

 c. Fastigium moderately acute-angulate; eyes separated by an interspace about 

 equal to one-third the greatest width of the fastigium; form as usual in the 



genus S. cylindrodes. 



c' . Fastigium very strongly acute-angulate; eyes separated by an interspace 

 about equal to one-fourth the greatest width of the fastigium; form very 



slender S. mexicana. 



I/. Subgenital plate of the male with a pair of lateral horn-like processes, but no 



median erect lobule 'S'. ritreipennis n 



a'. Subgenital plate of the male produced and compressed, without accessory lobes 

 or styles. 

 b. Size small (male 23-25 mm.); fastigium distinctly slender, slightly longer than 



broad S. gracilis. 



h' . Size large (males 32-33, females 40-42 mm.); fastigium broad, at least as broad 

 as long, in the female much broader than long 5. coccineipes. 



'< This name will have to be used in place of Stenacris chlorizans Walker {Arnilia 

 chlorizans of authors). Marschall's Gryllns vilreipennis (Zoologische Abhandlungen 

 aus den Annalen des Wiener Museums der Naturgeschichte, 1841, p. 214, pi. xviii, 

 fig. 6) described from Georgia is clearly the same insect as that to which Walker's 

 name is now applied, agreeing in structure, color pattern, and size. In consequence 

 the species must be known as Stenacris vitreipennis (Marschall). 



