AMERICAN COMPONENTS OF THE TENTYRIIN^ 369 



parallel and nearly straight from the base to beyond the middle, 

 where they are broadly rounded, thence converging and feebly 

 sinuate to the prominent apical angles as in pruinosa^ the punc- 

 tuation still coarser, moderately close and more uneven, with 

 fewer coarse punctures intermingled, without impunctate line, 

 becoming abruptly not much coarser but very dense and confluent 

 only in about lateral eighth of the width ; elytra nearly as in p)'u- 

 inosa but less elongate, with the interstitial punctures small, sparse 

 and similarly confused, the serial punctures very coarse, except 

 in apical two-fifths ; abdomen feebly rugulose, finely but more 

 strongly, sparsely punctured medially, the basal segment very 

 coarsely so throughout. Length 5.2-6. i mm. ; width 2.4-3.0 mm. 

 Colorado tonsa n. sp . 



5 — Body rather broadly oval, moderately convex, shining, piceous, 



the elytra and under surface rufescent, the legs dark piceo-rufous ; 

 head nearly as in p7-7iinosa but less strigose, especially toward 

 the middle of the occiput ; prothorax fully two-thirds wider than 

 long, the sides feebly arcuate, becoming parallel from behind the 

 middle to the base, converging and becoming subsinuate to the 

 very acute apical angles, the basal angles right, slightly prominent 

 posteriorly, the apex much narrower than the base, the latter very 

 feebly sinuate toward the sides; punctures rather large, very deep, 

 even in size and distribution and separated by about twice their 

 own diameters, with a narrow and distinct median impunctate 

 line, very gradually becoming only slightly larger but dense though 

 not perfectly coalescent laterally ; elytra in form nearly as in tonsa 

 but with the punctures of the unimpressed series only moderately 

 coarse and well separated, becoming subobsolete in apical two- 

 fifths ; abdomen feebly rugulose, finely, sparsely punctate medially, 

 the basal segment throughout sparsely and not very coarsely punc- 

 tate. Length 5.0 mm. ; width 2.3 mm. Colorado... ignava n. sp. 



6 — Form oblong-oval, strongly convex, strongly alutaceous in lustre, 



piceous-black, the legs rufous ; head but little wider than long, 

 somewhat coarsely, extremely densely punctato-strigose through- 

 out, except in a very small triangular spot just behind the epi- 

 stoma, which is simply punctate; prothorax transverse, nearly 

 four-fifths wider than long, the apex but little narrower than the 

 base and evenly, moderately sinuate from angle to angle, the latter 

 only slightly acute and not prominent, the base broadly lobed in 

 the middle, thence transverse and subrectilinear to the angles, 

 which are slightly obtuse, the sides feebly arcuate ; disk slightly 

 wider at basal third than at base, very coarsely, deeply and closely 

 punctured throughout, the punctures becoming longitudinally con- 

 fluent laterally but scarcely at all larger, without suspicion of a 

 median impunctate line ; elytra scarcely a third longer than w'ide, 

 two and one-half times as long as the prothorax and scarcely 

 visibly wider, with feebly impressed series of coarse, deep and 

 not very close-set punctures, extending to the apex and not abbre- 

 viated as in the preceding species, the intervals very minutely, 



