512 THE STUDY OF INSECTS. 



I. Tarsi with second segment dilated. 



J. Tarsal claws appendiculate or toothed ; first 

 ventral abdominal segment with distinct curved 

 coxal lines, p. 534 COCCINELLID^E. 



JJ. Tarsal claws simple ; first ventral abdominal 

 segment without coxal lines, p. 535. 



ENDOMYCHID^E. 



II. Tarsi with second segment not dilated. 



J. Elytra entirely covering the abdomen ; ventral 

 abdominal segments nearly equal, p. 542. 



LATHRIDIID;E. 



JJ. Elytra truncate ; the first and fifth ventral ab- 

 dominal segments longer than the others. 

 K. Maxilla with galea distinct; anterior coxae 



small, rounded, p. 542 MONOTOMID^E. 



KK. Galea wanting, anterior coxae subtrans- 



verse. p. 541 NITIDULID^E. 



GGG. All tarsi four-jointed. 



H. The first four abdominal segments grown together 

 on the ventral side. 



I. Tibiae dilated, armed with rows of spines, and 

 fitted for digging, p. 543 HETEROCERID^E. 



II. Tibiae not dilated nor fitted for digging, p. 537. 



COLYDIID^E. 



HH. Ventral segments of abdomen not grown to- 

 gether. 



I. Wings fringed with hairs. 



J. Hind coxae contiguous and with plates cover- 

 ing the femora entirely or in part. p. 529. 



SILPHID;E. 



JJ. Hind coxae separate and not covering the 

 femora, p. 543 CORYLOPHID^E. 



II. Wings not fringed with hairs. 



J. Anterior coxae transverse, p. 541. 



NlTIDULIDjE. 



JJ. Anterior coxae either globose or oval. 

 K. Anterior coxae globose. 



L. Tarsi slender, p. 535 ENDOMYCHID/E. 



LL. Tarsi more or less dilated and spongy 



beneath, p. 536 EROTYLID^E. 



KK. Anterior coxae oval. 



