1226 



FAMILY lilfl. CHRYSOMELIDzE. 



LXXV. Chalepus Thunb. 1S05. (Gr., "difficult.") 



The members of this genus resemble those of the preceding in 

 form, but differ by having all the joints of the antennae distinct, the 

 elytra with the alternate intervals usually costate and the middle 

 tibia? straight. Six species have been taken in the State, while an- 

 other probably occurs. They were listed by Henshaw under Odon- 

 toia. 



KEY TO INDIANA SPECIES OF CHALEPUS. 



a. Elytra with ten rows of punctures. 



&. Elytra not costate ; form narrow, parallel ; thorax red, elytra blue. 



COLLARIS. 



1)1). Elytra costate. 



c. Elytra with three entire eostae only. 

 d. Elytra black, or at most with reddish humeri. 



e. Body beneath black; thorax red with discal dark space; hu- 

 meri of elytra red. 2269. scapularis. 

 ee. Body beneath red ; thorax wholly red ; elytra wholly black. 



2270. BICOLOR. 



dd. Elytra mostly red. 



/. Elytra with a very narrow black sutural line, which does not 

 reach apex. 2271. hornii. 



■ ff. Elytra with a black sutural stripe which broadens gradually 

 from base to apex. 2272. dorsalis. 



cc. Elytra with three entire costae, and a fourth represented at base 

 and apex between the second and third; color reddish-yellow, 

 with darker spaces on elytra ; length 6-6.5 mm. 2273, rubra. 

 aa. Elytra with eight rows of punctures; color reddish with dark mark- 

 ings ; length 3.5-4 mm. 2274. nervosa. 



C. cottaris Say, length 5.5-6 mm., is known from Colorado and 

 Illinois. 



2269 (7075). Chalepus scapularis Oliv., Ent, VI, 180S, 766. 

 Wedge-shaped, robust. Black, feebly shining; a broad stripe each side 



of thorax, humeral angles of elytra, and sometimes the base of femora, dull 

 red. Thorax widest at base, sides subangulate at middle; disk depressed 

 near base, coarsely and deeply punctured. Elytra each with three costae, 

 the second and third separated by four rows of punctures ; apex serrulate. 

 Length 5.5-7 mm. 



Steuben, Starke, Marshall and Vigo counties; scarce. June 15- 

 September 18. Occurs on the hog-peanut, Falcata comosa L. 



2270 (7077). Chalepus bicolor Oliv., Encyc. Method., VII, 1792, 96. 

 Elongate, nearly parallel. Black, subopaque ; thorax, scutellum, under 



surface, and often the base of femora, bright red. Vertex sulcate. Thorax 

 very little wider at base, sides obtusely angulate; disk very coarsely, dense- 

 ly and deeply punctured. " Elytra with sides and apex serrulate ; disk punc- 

 tured and costate as in scapularis, except that the four rows of punctures 



