— i8S— 



Ac. 

 Elytra rounded and margined at tip. 

 Black; elytra blue, polished, coarsely and sparsely punctured, antennce and 



legs either black or yellow chalybaea. 



Black; head and prothorax light rufous. 

 Elytra shining, very coarsely punctured, tip subtruncate; prothorax with- 

 out impressions capitata. 



Elytra densely, not coarsely punctured, tip rounded; prothorax impressed 



near the hind angles americana. 



Black, hoary with fine white pubescence, ]irothorax dull red . haematites. 

 Black, with white pubescence; head, prothorax, legs and scape of antennce 



more or less yellow exigua. 



Elytra scarcely or not margined at tip. 



Dull black, hoary with fine white pubescence; head, legs and scape of an- 

 tennas sometimes ferruginous, or partly so . . . subargentata. 

 Dark blue, elytra with red humeral spot, sometimes wanting . molybdica. 



Ad. 

 Prothorax transversely excavated along the whole base, sides sinuate, tip 

 strongly tubular; body beneath, margins of prothorax and ely- 

 tral bands golden pubescent; tip truncate, legs ferruginous. 

 Yellow bands broader at the suture. 



Antennae very stout, dark ferruginous laeta. 



Antenna more slender, nearly black {zebra) nitens. 



Bands equal, straight ' . . . tribalteata. 



Prothorax feebly excavated each side near the hind angles; pubescence not 

 golden. 

 Brownish yellow, densely clothed with fine pubescence, hind angles of pro- 

 thorax more explanate and prolonged; elytra with a faint lateral 



fuscous spot at the middle; tip truncate impura. 



Prothorax narrowed from the base, sides subsinuate; elytra yellow, with 

 two marginal spots and tip black, the latter dehiscent, not trun- 

 cate; often has in addition a black common spot on the suture, 

 sometimes narrowly connected with black tip . . . cordifera. 

 Prothorax not narrowed from the base, sides sinuate, rounded in front; 

 elytra with yellow bands or spots, variously confluent, some- 

 times entirely black, suture dehiscent, tip rounded . instabilis. 

 Prothorax not wider than long, more finely and densely punctured, body 

 less robust; elytra less dehiscent at tip, which is more broadly 

 rounded and scarcely margined; yellow, with base, two bands 

 and apex black, bands sometimes interrupted . sexmaculata. 

 Prothorax more rounded in front; elytra depressed on disc, truncate and 

 emarginate at tip; yellow, with two blotches, humeral and me- 

 dial, and tip black vexatrix. 



Legs and antennae ferruginous; elytra feebly dehiscent, tips broader 



and nearly rounded, distinctly margined; elytra yellow, entire 



margin black, a discoidal spot near the base, large lateral one 



near the middle, and transverse one near tip black, sexspilota. 



Prothorax bruadtr than long, campanulate, trans\ersely excavated or de- 



