16 Mr. G. C. Champion's Revision of the Mexican 



6*. Second antennal joint ((J) with 

 a short, slender appendage; 

 prothorax immaculate, 

 c^. Head, elytra, and legs black . nigripennis, n. sp. 

 d^. Head and elytra blue, femora 



rufo-testaceous . . . jemoralis, Gorh. 

 c*. Second antennal joint (cJ) with- 

 out visible appendage; head 

 and legs black; prothorax 

 immaculate; antennae {^) 

 partly testaceous, 

 e^. Elytra coarsely punctate, 

 violaceous ; intermediate 

 antennal joints ( c^) strongly 

 transverse,stout ; head broad hrevicoUis, n. sp. 

 /^. Elytra finely punctate, bluish 

 black; intermediate anten- 

 nal joints ((^) narrower and 

 longer; head smaller . . {tricolor. Say.] 

 6'. Head with a smoother subglabrous, 

 depressed area on each side 

 anteriorly, at least in ^ ; second 

 antennal joint {^) with a long 

 appendage. 

 (Z*. Head blue to anterior margin; 

 prothorax immaculate ; an- 

 tennae testaceous at base in 

 both sexes, third joint small 



in (J amplicollis, n. sp. 



e*. Head testaceous in front; pro- 

 thorax black on disc, or 

 immaculate ; antennae wholly 

 testaceous, and with third 

 joint greatly thickened in ^ . nigriceps, Say. 

 b^. Body rather slender ; head and femora 

 black, tibiae and tarsi testaceous ; 

 prothorax spotted or immaculate ; 

 elytra blue, finely punctate, 

 widened posteriorly ; second anten- 

 nal joint ( c?) with a long append- 

 age parvus, Schaeff. 



b^. Elytra blue, violaceo-fasciate before 

 middle, the sutural edge and a tri- 

 angular lateral patch testaceous; 

 head uniformly punctate, dark; 

 prothorax immaculate; legs black; 



