ACRID 1D^. 



627 



Fore wings as long as the body. Length of the body 7% lines ; expansion 

 of the fore wings 16 lines. 



It is the most diminutive of all the typical species of Acridium. 

 a. Madagascar. Presented by J. Caldwell, Esq. 



Asia. 



A. Hind wings rosy at the base. 



a. Keel of the prothwax well defined. vinosum. 



b. Keel of the prothorax very slight. - succinctum. 



B. Hind wings purple at the base. - vioiascens. 



c. Hind wings not rosy nor purple at the base. 

 * Hind wings spotted. 



f Hind wings yellow at the base. - flavescens. 



ft Hind wings not yellow at the base. fumosum. 



** Hind wings not spotted. 



f Prolhorax spotted. - - pardalinum. 



ft Prothorax not spotted. 



J Prothorax much widened bindward. rubescens. 



$ Prothorax not much widened hindward. 

 Prosterual spine acute. 

 X Keel of the prothorax well defined. 



o. Tip of the vertex hexagonal, - - albidiferum. 



oo. Tip of the vertex subhexagonal. - punctarium. 



ooo. Tip of the vertex nearly triangular. - - dorsale. 



oooo. Tip of the vertex conical, not transverse. deponens. 



ooooo. Tip of the vertex transverse. - - Sinense. 



X X Keel of the prothorax very slight. 



o. Tip of the vertex transverse. - nitidulum. 



oo. Tip of the vertex nearly round. saturatum. 



Prosternal spine very obtuse. 



X Prosternal spine compressed. - Coreanum. 



X X Prosternal spine not compressed. 



o. Tip of the vertex hexagonal. - - innotabile. 



oo. Tip of the vertex nearly round. - - delineolatum. 



A. vinosum, fumosum, flavescens, pardalinum, rubescens and 

 vioiascens are comparatively typical species of the genus. A. succinctum 

 has a slight tendency to the Heteracris form ; this form appears more in 

 A. deponens, Sinense and Coreanum. The hind femora of A. dorsale are 

 very thick and in that character it resembles the Caloptenus type. 



ACRIDIUM ALBIDIFERUM. 



Mas et foem. Fulvum,robustum ; caputpostica albidum,fastigiohexagonali ; 

 antenna nigrcs ; prothorax scaber, carinatus, nonnunquam ferrugineo 

 vittatus, postice latcscens et testaceo postulatus, margine postico pro- 

 ducto; prosterni spina longa, compressa, acuta, nonnunquam alba; 

 femora postica nonnunquam albida, extus nigro bilineata, intus rufo 

 vitlata ; tibice postica ccerulea aut purpurascentes, subtus albce, spinis 

 albis apice nigris ; alee anticce pallide cinerecB, nonnunquam strigulis 

 plurimis nigris, plaga basali e venis nigricantibus. 



