ADEPLIAGA. 



Protadephaga. 



hi 



Cieindelidas. 



Cupedidae. Gyrinidae. Carabidae. 



Haliplidas. 



Dytiscidas. 



Hygrobiidae. 



Amphizoidae. 



Paussidae. 



Rhysodidas. 



The following table will serve to distinguish the families of the 

 Adepilaga, as here constituted. In all succeeding tables the only 

 families dealt with are those of which members have been known 

 to occur in the Indian region ; we have, however, included in the 

 present one all the known families, as the connecting links are 

 very interesting, and, moreover, two families out of the three which 

 have not yet occurred in India (Amphizoidje and Hygbobiiile 

 (PelobiiDjE)) are represented in Tibet. 



I. Abdomen with six or seven (rarely eight) 

 visible ventral segments, the first three 

 connate but with the sutures apparent, 

 i. Metasternum with a transverse suture 

 before the posterior coxae. 

 1. Transverse suture before posterior coxa3 

 extending across the metasternum, 

 which is continued behind in a tri- 

 angular process between the coxas. 

 A. Posterior coxae normal ; antennas 

 11 -jointed. 



a. Clypeus extending on each side 



beyond the base of the antennas . . 



b. Clypeus not extending on each side 



beyond the base of the antennae . . 

 13. Posterior coxae extended into two 



Cicindelidae, p. 5: 

 Carabidae, p. 54. 



[Haliplidae], p. 61 



broad plates covering the first three 



segments of the abdomen ; antennas 



10-jointed 



2. Transverse suture of metasternum very 

 short, only reaching across the central 

 portion ; metasternum not prolonged 

 between the posterior coxas. 



A. Anterior coxas conical: tibiae and 



tarsi with swimming hairs 



B. Anterior coxas globular ; tibias and 



tarsi without swimming hairs 



Metasternum without a transverse suture 



before the posterior coxae. 

 1 . Posterior coxas contiguous on their inner 

 margin : metasternum slightly produced 

 between them ; legs natatorial. 



Eyes not divided ; antennas normal , . Dytiscidae, p. 62 



THygrobiidaej, 



p. 60. 



[Amphizoidae], p. 59. 



