THE CLICK BEETLES. 721 



135G (4097). CARDIOPHORUS CONVEXUS Say, Journ. Phil. A cad. Nat. Sci., 



Ill, 1823, 169; ibid. II, 110. 



Elongate, sub-convex. Dark sooty brown or piceous, shining; legs and 

 two basal joints of antennae reddish-yellow. Thorax longer than wide, 

 widest at middle, strongly convex, narrowed in front; hind margin with 

 a short groove each side, tridentate at middle ; disk very finely and evenly 

 punctate. Elytra wider than thorax, gradually tapering from base to apex, 

 striate, the stria 1 punctate; intervals slightly convex, very finely punctulate. 

 Body beneath clothed with fine brownish pubescence, closely punctulate. 

 Length S-10 mm. 



Throughout the State; common. April 7-July 26. Frequents 

 leaves and branches of various shrubs in May and June, and then 

 one of the most common Elaters taken by beating. 



1357 (4109). CARDIOPHORUS GAGATES Erichs.. Zeitschr., II, 297. 



Oblong, rather stout, convex. Black, shining, sparsely clothed with 

 fine grayish pubescence. Antenme stout, strongly serrate in male, joints 3 

 to 6 one-half longer than wide. Thorax very convex, slightly longer than 

 wide, sides strongly rounded; base tridentate at middle and with a short 

 groove each side; surface densely and finely punctate. Elytra either sub- 

 parallel or narrowed and rounded from the humeri, striate, punctate; in- 

 tervals convex and finely punctulate. Length 5.5-7.5 mm. 



Northern half of State, frequent ; Lawrence and Posey counties 

 only in the south. April 21-August 1">, 



C. co>ir<\n(lns Lee., black, shining, length 7.2-10 mm., is known 

 from Canada, New England and Ohio; C. rolnixhts Lee., stout, 

 black, feebly bronzed, legs reddish-brown, length 7-10 mm., ranges 

 from Massachusetts to Texas. 



XVII. HORISTONOTUS Cand. 1860. (Gr., "defined + back.") 



Small slender species, having the margin of thorax well denned, 

 the edge running along the suture wlik-h divides the dorsal from 

 the pectoral region. 



1358 (4129). HORISTONOTUS CURIATUS Say, Trans. Amor. Phil. Soc., VI, 



183G, 173 ; ibid. II, G09. 



Elongate-oblong, subconvex. Piceous, feebly shining; legs, antenna? and 

 elytra dull reddish-yellow, the latter with a blackish crossbar at middle 

 which extends narrowly along the margin to apex. Antennte slender, very 

 little longer than thorax, feebly serrate. Thorax slightly longer than wide, 

 narrower at apex than at base, sides feebly curved, disk convex, sparsely 

 punctate, hind margin with a short groove each side near the spines. Ely- 

 tra not wider at base than thorax, feebly narrowing to apex, deeply striate, 

 striae punctate; intervals convex, sparsely punctulate. Tarsal claws den- 

 tate from the middle to the base. Length 4-4.5 mm. 



