478 Mr. B. P. Uvarov — A Revision of 



Key to the Species. 



1 (2). Fastigium of the vertex distinctly irn- ^ 



pressed, less sloping. Frontal ridge not 

 at all dilated above tlie ocellura. Head 

 and pronotum above with a pale median 

 'fascia prolonged into the anal field of 

 elytra. Elytra almost iinicolorous brown- 

 ish, with very small and indistinct, scat- 

 tered, darker spots. Wings iufumate 

 throughout, with the base pale violaceous. 

 (Ceylon.) 1. violascens (Walk.). 



2 (1). Fastigium of the vertex almost flat, dis- 



tinctly sloping. Frontal ridge above the 

 ocellum slightly dilated. Coloration 

 brownish, with more numerous darker 

 spots on the elytra, forming more or less 

 distinct narrow oblique fasciae in the 

 apical part. Wings infumate through- 

 out, with the base rosy. (India, China.) 2. vinosa (Walk.). 



1. Pachyacris violascens (Walk.). 



**1870. Acridiwn violascens, Walker, Cat. iii. p. 687. no. 38. 



1910. C{yrtacanthacris] violascens, Kirby, Cat. iii. p. 452. no. 53. 

 1914. Orthacanthacris violascens, Kirby, Fauna Br. Ind., Acr. 

 p. 229. no. 276- 



The coloration, as described in the key, seems to be fairly 

 constant in the series before me. In one specimen from 

 Mysore, S. India, there are, however, fairly well-pronounced 

 dark spots on the elytra, forming irregular oblique fascise, 

 like those in vinosa ; at the same time the upper median 

 fascia on the head and pronotum is well developed, and the 

 shape of the frontal ridge and fastigium is quite typical for 

 violascens. In case these characters prove to be present 

 in all specimens from the Indian mainland, they must be 

 separated as a distinct geographical form. 



Geographical distribution. This species seems to be very 

 common in Ceylon, whence came Walker's types; there is 

 only one specimen known to me from the mainland (Mysore), 

 which may represent a distinct subspecies (see above). 

 I have seen also one specimen from the Madrid Museum, 

 labelled " Usambara," which is doubtless incorrect. 



2. Pachyacris vinosa (Walk.). (Fig. 6 a.) 



**1870. Acridium vinosum, Walk. Cat. iii. p. 588. no. 40. 

 **1900. Cyrtacanthacris wingatei, Kirby, Ann. & Mag. Nat. Hist. (7) 

 vi. p. 381. 



1910. Cljjrtacanthacris] vinosa, Kirby, Cat. iii. p. 452. no. 54. 



1910. C[yrlacanthacris^ wingatei, Kirby, /. c. no. 55. 



The type of C. wingatei is much smaller and much darker 



