64 Mr. W. F. Kirby's 



15. Acrida sulphionpennis. 



Tryxalis sulphur iijennis, Gerstaecker, Arch. f. Nat., 

 XXXV, p. 215 (1869); Von der Decken's Eeisen, iii 

 (2), p. 33, pi. iii, fig. i (1873). 



Hab. Transvaal : Pretoria {Distant) ; Natal : Durban 

 {Distant) ; Zanzibar {Gerstaecker). 



One of the smaller species of the genus, and apparently 

 not very common. 



16. Acrida madecassa. 



Tryxalis madecassa, Brancsik, Jahresb. Ver. Trencsen, xv, 

 p. 186 (1893). 



Hcd). Nyasaland : Fort Johnston {Rendcdl). 

 A single example, agreeing with specimens in the 

 British Museum from Madagascar. 



17. Acrida rufescens. 



Truxcdis rufescens, Palisot de Beauvois, Ins. Afr. Amer., 



p. 17; Orth., pi ii, fig. 2 (1805). 

 Acrida rvfescens, Stal, Rec. Orth., i, p. 97 (1873). 



Hcd>. Nyasaland: Fort Johnston (RoidaU). 

 A well-known West African species. 



Genus Tryxalis. 



Tryxalis, Blanchard, Hist. Nat, Ins., iii, p. 36 (1840). 

 Acridclla, Bolivar, Feuille Jeune Nat., xxiii, p. 41 (1893). 



18. Tryxalis nasuta. 



GryUus {Acrida) nasutus, Linnaeus, Syst. Nat. (ed. 10), i, 

 p. 427, n. 11 (1758). 



Hah. Transvaal : Rustenburg {Distant). 



A single pair. The male (from Rustenburg) has pale 

 yellow wings ; the female (without locality) has the base 

 of the wings tinged with purple and red, and many of the 

 longitudinal nervures red. The male is very similar to 

 A. variabilis, Klug, and has no red or vinous colour on the 

 hind wings ; but the two insects exhibit so many points of 

 resemblance that I have ventured to put them together. 



