176 MEMOIRS ON THE COLEOPTERA 



surface shining blue-green, the legs black; head proportioned and 

 punctured nearly as in the preceding, the antennae similarly colored 

 but notably stouter; prothorax more distinctly wider than the head, 

 evidently wider than long, similar throughout to the preceding, 

 except that the base is relatively broader and equal to the apex, and 

 that the surface laterally is much more strongly and closely rugose 

 in transversely anastomosing folds, the basal impressions nearly 

 similar and not anteriorly prolonged but broader, less sharply or 

 deeply impressed and more rugosely punctured; median stria deep 

 and conspicuous between the very feeble transverse impressions; 

 elytra a little more than a fourth longer than wide, similarly inflated 

 posteriorly and much narrowed basally, four-fifths wider than the 

 prothorax, the apices more sinuato-truncate, with the external angles 

 less broadly rounded; striae moderately fine, feebly impressed and 

 finely but strongly, very closely punctate, the intervals very nearly 

 flat and smooth, shining and with extremely fine, widely and ir- 

 regularly scattered punctures, which however are more easily ob- 

 served than in lauta; two punctures of the third interval distinct; 

 scutellar stria long and forming the oblique basal part of the first 

 stria as usual. Length 6.8 mm.; width 2.7 mm. Colorado (Boulder 

 Co.) puella n. sp. 



The only two species described above that are in any way mutu- 

 ally very closely allied are mridicollis and carulea; the prothorax is 

 very evidently more narrowed at base and more impressed laterally, 

 and the elytra more strongly sculptured and slightly more abbre- 

 viated, in the latter, and there is a decided difference in the scheme 

 of interstitial punctuation, the punctures in mridicollis being 

 extremely small and feeble and arranged in irregular single series, 

 while in ccerulea they are much stronger, more numerous, though 

 sparse, and are more irregularly scattered over the entire surface. 

 Whether or not carulea may be the true subcordata of Chaudoir, 

 however, I have no means of knowing, but am of the opinion that 

 they are not the same, in view of the very local range of species in 

 the Arizona region, with its sharply separated and isolated mountain 

 systems. The above description of amcena Lee., is drawn from the 

 original, as I do not possess an example of that species. It is dis- 

 tinguished principally by the unusually transverse prothorax, deep 

 elytral striae and convex intervals ; the coloration of the three basal 

 joints of the antennae, as recorded by the author, is also quite dif- 

 ferent from the usual type, as stated above under canora. 



