508 THE STUDY OF INSECTS. 



JJ. Tarsal claws of usual size ; ventral abdominal 

 segments usually free ; sometimes (Buprestidae) 

 the first two are grown together. 

 K. Abdomen with only five ventral segments. 

 L. Femur joined to the apex or very near the 

 apex of the trochanter, p. 553. ..Ptinidae. 

 LL. Femur joined to the side of the tro- 

 chanter. 



M. Anterior coxae globular or transverse, 

 usually projecting but little from the 

 coxal cavity. 



N. Anterior coxae transverse, more or 

 less cylindrical. 



O. Posterior coxae grooved for the re- 

 ception of the femora. 

 P. Legs stout, retractile ; tibiae di- 

 lated, usually wiih a furrow near the 

 outer end for the reception of the 

 tarsi ; tibial spurs distinct, p. 542. 



Byrrhidje. 



PP. Tibiae slender, with small and 



sometimes obsolete terminal spurs, 



or without spurs. 



Q. Head constricted behind ; eyes 



smooth, p. 553 Cupesidae. 



QQ. Head not constricted behind ; 

 eyes granulated, p. 544. 



DASCYLLIDAE. 



OO. Posterior coxae flat ; not grooved 

 for the reception of the femora. 

 P. Tarsi more or less dilated, first 

 segment not short, p. 541. 



NlTTDULIDAE. 

 PP. Tarsi slender, first segment 



short, p. 542 Trogositid^k. 



NN. Anterior coxae globular. 



O. Prosternum with a process which 

 extends backward into a groove in 

 the mesosternum. 



P. The first two abdominal segments 

 grown together on the ventral side, 

 p. 548 Buprestidae. 



