5IO THE STUDY OF INSECTS. 



OO. Antennae with the last three seg- 

 ments forming a large club. p. 538. 

 Dermestid^e. 



OOO. Antennae with the last three 

 segments somewhat larger than the 

 preceding, but not suddenly en- 

 larged, p, 542 Derodontid^b. 



NN. Posterior coxae not dilated into plates 



partially protecting the femora. 



O. Posterior coxae flat, not prominent, 

 covered by the femora in repose. 

 p. 552 Clerid^e. 



OO. Posterior coxae oval, not promi- 

 nent, p. 533 . SCAPHIDIID^E. 



OOO. Posterior coxae conical and 

 prominent. 



P. Anterior coxae with distinct tro- 

 chantins. p. 552. ..Malachiid^e. 

 PP. Anterior coxae without tro- 

 chantins. p. 553. . . LYMEXYLiDiE. 

 KK. Abdomen with six or more ventral seg- 

 ments. 

 L. Anterior coxae flat. p. 529. 



PLATYPSYLLIDiE. 



LL. Anterior coxae either globular or conical, 

 M. Anterior coxae globular. 

 N. Prosternum prolonged behind, form- 

 ing an acute process moving in the 

 mesosternum. p. 544. . . .ELATERiDyE. 

 NN. Prosternum not prolonged behind. 



p. 529 LEPTINID.E. 



MM. Anterior coxae conical. 

 N. Posterior coxae not prominent, flat,, 

 covered by the femora in repose. 



p. 552 CLERIDiE. 



NN. Posterior coxae more or less conical 

 and prominent at least internally, not 

 covered by the femora in repose. 

 O. Posterior coxae widely separated. 

 P. Eyes wanting or inconspicuous. 



p. 529 SlLPHIDiE. 



PP. With well-developed eyes. 



