774 FAMILY XXXVIII. TflKOSCID^. 



re-eived in grooves along the inner margins of the intlexecl portions 

 of thorax; head immersed in thorax to the eyes; mouth inferior, 

 applied in repose to the prosternum ; thorax deeply sulcate on under 

 side along the sutures for reception of antennas; prosternum with a 

 rounded lobe in front which protects the mouth ; front and middle 

 coxiB small, rounded, without troohantins, the cavities of the former 

 closed behind by the mesosternum ; hind coxas transverse and dilated 

 into a plate partly covering the thighs: tarsi short, five-jointed, 

 joints 1 to 4 being furnished beneath with long membranous lobes; 

 claws simple. 



The name TJiroscvs, that of the typical genus, is ill-suited to 

 these beetles, since it is derived from a Greek word meaning "to 

 leap upon. ' ' The fixity of the thorax upon the trunk precludes any 

 such motion. The family is represented in the United States by 

 three genera and 18 species. Of these five species, belonging to two 

 genera, have been taken in Indiana. The principal paper on the 

 North American forms is by 



Horn. — "Synopsis of the Throseidas of the United States," in 

 Trans. Amer. Ent. Soc, XII, 1885, 198-208. 



KEY TO INDIANA GENEEA OF THEOSCID^. 



(/. Antennae serrate, their cavities on prosternum short, straight; no tarsal 



grooves. I. Dbapetes. 



a«. Antennse terminating in a three-jointed club, their cavities long and 



cur%'ed ; tarsal gnioves present ou metastemum. II. Throscus. 



I. Drapetes Redt. 1849. (Gr., "to run away.") 



To this genus belong four species, one of which has been taken in 

 the State, while two of the others may in time be found. Since the 

 table by which they are separated is brief, it is herewith given. 



KEY TO SPECIES OF DRAPETES. 



a. Thorax black. 



I). Elytra red and black. 



c. Elytra with a broad sub-basal red crossbar. 1475. geminatus. 



cc. Elytra with humeral and subapical red spots. 



quadripustuiatus. 



1)1). Elytra wholly black. nitidus. 



na. Thorax red, elytra black. rubricolus! 



14Tr, (4542). DiiAPETES geminatus Say, Ann. Lye. Nat. Hist., I, 1825 2G4- 

 ibid. I, 398. 

 Oblong, convex. Black, shining, very sparsely pubescent. Elytra with 

 a broad sub-basal red crossbar, this sometimes divided at the suture or re- 

 duced to a round spot on each side. Thorax as wide at base as long, grad- 



