ACETDIIJ^yE. 11 



Subfamily I. ACRYDIIN.l^. 



These insects are amongst the smallest species o£ the LocuSTiDiE, 

 and are called Grouse-Locusts in America. They are very 

 numerous in meadows and swampy places and many of the 

 species may almost be regarded as siil)aquatic. Till recently they 

 have been somewhat neglected by entomologists, but Professor J. 

 L. Hancock, of Chicago, has made a speciality of the subfamily, on 

 which he has published an important series of works, especially 

 in Wytsman's " Genera Insectorum " (family AcRiDiiOyE, sub- 

 family Tetrigixyi:), in which he divides the subfamily into nine 

 sections, six of which are represented in the Indian Fauna. 



Keij to the Grotips of AcnYDllN^. 



1 (2) Auteniife much flattened, except at base 



and apex Tripetahcerini, p. 11. 



2 (1) Anteuiiio filiform. 



3 (10) Anterior femora compressed, carinate 



above. 



4 (5) Frontal costa forked between the ocelli, 



the rami strongly divergent, forming 



a frontal scutellum Cladanotim, p. 14. 



5 (4) Frontal costa furcillate, but the rami 



diverging only a little or moderately 

 in front, or parallel, very frequently 

 separated only in a slight degree by 

 a sulcus, 

 (i (7) Posterior angles of lateral lobes spined; 

 first joint of hind tarsi generally 

 longer than the third Scelimcmni, p. l'O. 



7 (6) Posterior angles of lateral lobes rarely 



spined ; first joint of hind tarsi not 

 longer than the third. 



8 (9) Posterior angles of lateral lobes slightly 



produced, obliquely truncate, rarely 

 spined ; first and tjiird joints of hind 

 tarsi nearly equal in length Metrodorini, p. 43. 



9 (8) Posterior angles of lateral lobes de- 



pressed, more or less rounded ; third 

 joint of hind tarsi shorter than the 



first Acrijdiini, p. .57. 



10 (3) Anterior femora sulcated above Batrac/a'diini, Y). 78. 



Group I. TIUPETALOGEIUNI. 



Key to the Genera. 



1 (2) Front bifid ; tegmiua and wings 



rudimentary Tripktalocera, 'NVe.-tw., p. 12. 



2 (1) Front acaminate ; tegmina and 



wino-s obsolete Birmaxa, Brunn., p. 13. 



