244 MEMOIRS ON THE COLEOPTERA 



rado (Boulder Co.). Collected at Magnolia by Mrs. T. L. Casey. 



aurora n. sp. 



Head narrower than the prothorax in both sexes; body deep black 

 throughout, the legs (of 1 ) deep black, all the femora abruptly bright 

 red in basal third to half, or ( 9 ) dusky testaceous, the tibiae and 

 tarsal joints black at apex, the femora black apically; pubescence 

 very short, pale and coarse, sparse throughout; head finely, sparsely 

 punctate throughout, the occiput sloping upon the neck as usual, 

 the antennae (cf) slender, wholly black and nearly four-fifths as 

 long as the body, or ( 9 ) scarcely more than half as long as the body, 

 dusky-testaceous, black at base; prothorax in general outline nearly 

 as in the preceding, as long as wide, minutely, sparsely punctate, 

 not more closely basally (cf ), or rather less sparsely and more coarsely 

 ( 9 ) ; elytra nearly similarly and moderately cuneiform in both sexes, 

 narrower in the male, the apical truncatures straight to feebly 

 sinuate; punctures notably fine, barely more than half as distant 

 as in the preceding and much finer throughout, though, as usual, 

 becoming larger basally and especially toward the suture; legs and 

 abdomen as usual; basal joint of the hind tarsi not quite as long as 

 the remainder. Length (c? 9 ) 7.5-9.5 mm.; width 2.3-3.2 mm. 

 Colorado (Boulder Co. Magnolia, and Eraser, C. A. Frost). 



coloradensis n. sp. 



I Body sexually almost similar and moderately stout, a little less 

 stout in the male, the elytra almost similarly and moderately tapering 

 in both sexes, black, the elytra (cf ) black, with the marginal bead 

 rufous and with the legs rufo-piceous, the femora black, rufous 

 basally, nearly similar in the female, the latter, however, with the 

 elytra blackish-subaeneous, with a discal testaceous vitta, which is 

 very broadly interrupted medially, the lateral bead, broadening 

 apically and basally, also testaceous; pubescence very short through- 

 out, coarser and paler on the elytra as usual; head small, rather 

 finely but deeply and closely punctate throughout, the tempora 

 obliquely arcuate to the neck, much less prominent than the very 

 convex eyes; antennae peculiar, slender as usual but unusually short 

 in both sexes and apparently a little longer in the female, one-half 

 to three-fifths as long as the body, piceous-black basally; prothorax 

 much wider than the head, as long as wide, much narrowed and con- 

 stricted at apex, not very finely punctate, the punctures close-set 

 and with the usual smooth line (cf), or finer and sparser (9); 

 smooth median line striate along the middle; prominences widely 

 separated and subacutely prominent; elytra truncate at tip, finely, 

 not at all closely punctate, the punctures a little larger basally; 

 last ventral slightly truncate at apex in the male, rounded in the 

 female. Length (cf 9 ) 8.0-8.5 mm.; width 2.8-3.0 mm. Maine 

 (Paris and Monmouth), C. A. Frost cavicollis n. sp. 



Body nearly as in the preceding but larger and stouter and with the female 

 elytra not cuneiform but parallel ; color black, the elytra pale tes- 

 taceous, with a narrow nubilous black sutural vitta and a feeble 

 longitudinal cloud at the summit of the flanks near the base, the 

 legs long, slender, testaceous, the tarsi piceous, the femora black 



