62 Annals of the Carnegie Museum. 



mm., 9 ■ 9 mm.; of tegmina, cf, 17 mm., 9 , 19 mm.; of hind femora, 

 d\ 17.5 mm., 9, 18.5 mm.; of hind tibiae, o 71 , 17 mm., 9, 18 mm. 



Habitat. — Chapada, Brazil, April (H. H. Smith). The types belong 

 to the Carnegie Museum. 



In some respects this insect approaches Chromacris and in others 

 it agrees best with Zoniopoda. It is especially to Z. omnicolor, 

 collaris, and exilipes of the last genus that it shows relationship. 



Genus Prionacris Stal. 



Prionacris Stal, Bihang. till K. Svensk. Vet.-Akad. Handling., V, no. 4, pp. 19, 55 



(1878). 



Representatives of this genus are confined to tropical South America, 

 where they are among the larger and more showy species. Thus far 

 three have been described. They may be separated as follows: 



Synopsis of the Species of Prionacris. 



A. Disk of wings tinged with rosaceous, general color of insect yellowish-olive. 



[New Granada.] compressa Stal. 



A A. Disk of wings tinged with green or blue. General color of insect dark olive 

 or brown. 



b. Wings tinged with cserulean. [Upper Amazons.] ccerulescens Bolivar. 



bb. Wings tinged with green. [Paraguay and southern Brazil.) . .erosa Rehn. 



92. Prionacris erosa Rehn. 

 Prionacris erosa Rehn, Proc. Acad. Sci. Philad., LX, pp. 176-179, figs. 10, 11 (1908). 



Habitat. — Chapada, Brazil, a single female specimen, which was 

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



Since Rehn's description included only the male, the following 

 measurements of the female may be of value: Length of body 46 mm., 

 of pronotum, 10.5 mm., of tegmina, 45 mm., of hind femora, 21.5 mm. 

 Otherwise this sex is practically the same as the male. 



Genus Titanacrts Scudder. 

 Titanacris Scudder, Proc. Bost. Soc. Nat. Hist., XII, p. 352 (1869). 



The large lobe-crested locusts, which comprise the present genus, 

 are confined to tropical America, where they are fairly well dis- 

 tributed from southern Mexico to southern Brazil. They were rather 

 carefully studied by Scudder (/. c.) and later by Pictet and Saussure 

 (Mitth. Schweiz. Ent. Ges., VII, pp. 362, 363, 1887). 



