96 MEMOIRS ON THE COLEOPTERA 



strong, impressed and at apical fourth; basal joint of the hind tarsi 

 as long as the fifth. Length (9) 9-7 mm.; width of elytra 3.8, of 

 prothorax 2.9 mm. Oregon persolus n. sp. 



Body much smaller and narrower than in any of the preceding, piceous- 

 black, the legs black, with the tibiae and tarsi rufescent; surface 

 extremely shining, the elytra without trace of alutaceous lustre; 

 head not quite three-fifths as wide as the prothorax, the eyes moder- 

 ate but very prominent, the mandibles black, testaceous ante-apic- 

 ally; antennae only moderately slender, infuscate, the basal joint 

 pale; foveae minute, the suture extremely fine and feeble; prothorax 

 barely one-half wider than long, all the edges rufescent from dia- 

 phaneity, widest before the middle, the sides nearly straight, rounding 

 anteriorly, the apex unusually narrowly and rather feebly sinuate, 

 with extremely broadly rounded angles; base transverse, very much 

 wider than the apical sinus, the bead fine and subentire, the angles 

 but little more than right and only very narrowly rounded at tip; 

 surface with transverse wavy rugulation, impunctate, the reflexed 

 margin very fine apically, broadening slightly and disappearing near 

 basal third; foveae unusually conspicuous, very deep, coarsely 

 linear, a third the total length and rugulose; elytra not quite one-half 

 longer than wide, about a sixth wider than the prothorax, parallel, 

 with feebly arcuate sides, arcuately rounding behind in about apical 

 third, the sinus very feeble but with its outer angle somewhat obvious 

 though very broadly rounded; striae very fine, slightly impressed, 

 the scutellar moderate, free, the feebly convex intervals irregularly 

 crossed by impressed creases except laterally, the puncture very 

 small, near apical third; basal joint of the hind tarsi as long as the 

 last; abdomen without trace of accessory setae or scattered punctures. 

 Length (cf) 7-O mm.; width 2.6 mm. Colorado (Boulder Co.). 



macilentus n. sp. 



13 Mentum tooth rather long, though rounded obtusely at apex. Body 

 oblong, moderately convex, shining, the elytra scarcely visibly 

 alutaceous even in the female, piceous in color, the under surface 

 paler, the legs, antennae, trophi and epipleura testaceous; head 

 three-fifths as wide as the prothorax, the foveae small, perforate, the 

 pale mandibles black at apex, the antennae not very slender but of 

 the usual length; prothorax two-fifths wider than long, almost 

 transversely truncate at the apex, which is very nearly as wide as 

 the base, the sides rounded anteriorly, feebly convergent and nearly 

 straight thence to the base, the fine basal bead entire, the angles only 

 slightly more than right, only extremely narrowly blunted; surface 

 with some confused creases, the lateral reflexed margin very fine 

 anteriorly, but little widening or incurved posteriorly and obsolete 

 near basal third, the bead continuing unchanged to the base as usual, 

 the foveae rather short, deep, punctate, separated from the sides by 

 a very feebly convex and sparsely punctulate area; elytra only two- 

 fifths longer than wide, but very slightly wider than the prothorax, 

 obtusely rounded in about apical third, the sides broadly rounded; 

 sinus short and extremely feeble; stiiae rather coarse and impressed, 

 the intervals distinctly convex, the puncture strong and at apical 



