AMERICAN COMPONENTS OF THE TENTYRIIN^: 4O5 



more coarsely and less sparsely near lateral fifth but elsewhere 

 laterally more thiely and closely, the median inipunctate line <lis- 

 tinct and \yell detined except anteriorly ; elytra fully Uvo-thirds 

 longer than wide, much less rapidly antl less obtusely ogiyal at 

 tip than usual, the sides broadly arcuate, gradually a little more 

 strongly so basally, the callus feeble ; disk three and one-half 

 times as long as the prothorax and barely a fifth wider, wholly 

 deyoid of broadly impressed lines, a very fine line near the suture 

 sometimes visible, finely, rather sparsely punctured suturally and 

 ^yith feebly marked lines of slightly coarser punctures, a little 

 larger but shallow and well separated laterally; female imknown. 

 Length 10. o mm. ; width 4.4 mm. New Mexico (Fort \Vingate). 



affinis n. sp. 



Form nearly as in eversns^ moderately convex, shining, the pubescence 

 a little longer, rather evident ; head moderate, coarsely, closely 

 punctate, the epistomal lobe large, moderately produced, very 

 obtusely ogival ; prothorax ( 9 ) one-half wider than long, the 

 sides very evenly and feebly arcuate from the acute but not 

 prominent basal angles to the small and acute, not much produced 

 and uneverted apical angles, the thickened margin gradually 

 broader toward base, the ridges moderate, unusually widely sepa- 

 rated anteriorly, short, evanescent near the middle, the inclosed 

 depression broad and feeble, the punctures rather small and sparse, 

 larger and closer laterally, the impunctate line distinct nearly to 

 the apex ; elytra nearly one-half longer than wide, more than 

 three times as long as the prothorax and nearly two-fifths wider, 

 very obtusely subparabolic at tip, the arcuate sides more strongly 

 rounded at base, the punctures not very fine, deep and moderately 

 close, becoming a little larger, shallow but well separated laterally, 

 the surface wholly devoid of impressed lines except the usual im- 

 pressions on the apical declivity ; male unknown. Length 9.0 

 mm. ; width 4.4 mm. New Mexico (Sta. Fe Canyon), — F. H. 

 Snow pertinax n. sp. 



13 — Black, the elytra very dark brownish-piceous to blackish, the 

 pubescence not long but conspicuous, the surface moderately 

 shining, head nearly as in affinis but with the epistoma more 

 prominent and much less obtuse; prothorax {^(^^ evidently less 

 than one-half wider than long, trapezoidal, with broadly and 

 feebly rounded sides, becoming slightly more converging and 

 feebly sinuate near the angles, which are very acute and not at all 

 blunt but not produced, the basal angles very acute and slightly 

 everted, the surface strongly flattened in nearly median half, the 

 sides of the flattened part slightly tumid anteriorly and the apical 

 lobe pronounced, the punctures not decidedly coarse but deep and 

 moderately separated, becoming very close-set and still coarser 

 laterally, the median line narrowly impunctate except anteriorly ; 

 scutellum rather rounded behind, wider than long ; elytra obtusely 

 ogival at tip, the sides broadly arcuate, more rounded at base, a 



