342 MEMOIRS ON THE COLEOPTERA 



to find some eleven species and subspecies among my material, 

 omitting sellata Lee., which is unknown to me but certainly valid; 

 it belongs to the medialis parva section below, but is much larger 

 than any one at present in my cabinet, all of that section here 

 described being very much smaller than maculata and allied forms. 

 The purely 12-jointed antennae in both sexes very clearly isolates 

 this genus among its allies. 



Posterior spots of the elytra at a considerable distance from the apices, 

 larger species 2 



Posterior maculation much closer to the elytral tips but never involving 

 the latter; intermediate spots much less ante-median, in fact only 

 very little before the middle; species much smaller in size 6 



2 Form very stout in the female, much the largest of the genus; colora- 

 tion as usual, the head, antennae, five pronotal callous spots, scu- 

 tellum and humeral, post-scutellar, large quadrate ante-median 

 and similarly large subapical spots on the elytra, deep black, the 

 two latter broadly united in pairs across the suture, forming trans- 

 verse blotches, and also united longitudinally by a narrow parallel 

 sutural black line; under surface black, the prosternum wholly red, 

 excepting the coxae; legs black throughout; elytra parallel; pro- 

 thorax strongly transverse, the sides parallel and but feebly arcuate, 

 abruptly rounding at apex and base. Length (9 ) 19.0 mm.; width 

 5.8 mm. Arizona (San Bernardino Ranch, Cochise Co.), Snow. 



robusta n. sp. 



Form less stout, not so large in size 3 



3 Prothorax much wider than long [almost twice as wide as long 

 LeConte], the sides of the elytra slightly converging from the base 

 even in the female, the ante-median spots of the elytra transverse, 

 not oblique, the two subapical isolated. Length 14.5 mm.; width 

 4.3 mm. New Mexico maculata Lee. 



Prothorax never more than one-half wider than long, undulatingly 

 rounded at the sides throughout, sometimes slightly prominent 

 behind the middle, narrowed more or less anteriorly to the broadly 

 truncate apex 4 



4 Male with the prosternum wholly black before the coxae, the black 

 extending slightly upon the lower part of the flanks; body more 

 elongate than usual, the antennae very long, fully two-thirds longer 

 than the body, the fifth joint distinctly longer than the sixth, the 

 latter 3.2 mm. in length; prothorax more elongate than in any other, 

 barely a third wider than long, unusually narrowed toward apex; 

 elytra long, strongly cuneiform, the basal spots small, the ante- 

 median obliquely subquadrate, attaining the suture but not pro- 

 longed, the ante-apical small. Length (cf) 16.5 mm.; width 4.8 

 mm. New Mexico (locality^unrecorded) argus n. sp. 



Male with the prosternum black but broadly and sharply red at apex. . 5 



5 Male with the prothorax unusually large, very nearly as wide as the 

 base of the elytra, one-half wider than long, but slightly narrower 



