774 FAMILY XXXVIII. — THKOSCID.S. 



received in grooves along tlie inner margins of the inflexed portions 

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

 ai)|)lied iu repose to the prosternu))! ; lliorax deeply snlcate on under 

 side along the sutures for reeeption of antenna^; prosternum with a 

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

 coxa^ small, rounded, witliout trocimntins. the cavities of the former 

 closed behind by the mesosternum ; hind coxffi transverse and dilated 

 into a ])late partly covering the thighs: tarsi short, five-jointed, 

 jdiiits 1 In 4 being furnished l)eneath with long membranous lobes; 

 (4aws sijiiple. 



The name Throscu.<i, that of the tyjiical genus, is ill-suited to 

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

 leap upon." Tlie fixity of the thorax upon the trunk precludes any 

 such motion. The family is i-ejn-c^ented in the United States by 

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

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

 North American forms is by 



TIoDi. — "Synopsis of the Throscida' of the ITnitecl States," in 

 Trans. Amer. Ent. Soc, XII, 1S85, 198-208. 



KEY TO INDIANA GENERA OF THROSCID.E. 



(I. Autoiiiue serrate, their cavities on prostoruum short, straight; no tarsal 



grooves. I. Drapetes. 



an. Antenna? terminating in a three-jointed clnb, their cavities long and 



carved; tarsal gro^vt-s present on nietasternnni. II. Throscus. 



I. Drapetes Kedt. 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. 



ff. Thorax black. 



I). Elytra red and black. 



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



cc. Elytra with hnmeral and snbapical red spots. 



quadripustulatus. 



hh. Elytra wholly black. nitidus. 



(/(/. Thorax red. elytra black. rubbicollis. 



t47r. (4r.42). Dkapetes geminatus Say, Ann. Lye. Nat. Hist., I, 1825, 2G4 ; 

 ibid. I, 398. 

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

 a broad snb-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- 



