148 MEMOIRS ON THE COLEOPTERA 



quite conspicuous. They are of stout and very convex, subcylindric 

 form of body, and, in nearly all, the elytra have each three fine 

 feeble and vestigial costules, the outer joining the side margin, as 

 is the rule throughout this genus wherever these costules appear 

 and in accordance with most of the subsequent genera of the tribe 

 here considered. 



Pronotum very convex, with a distinct rounded impression at the middle 

 of the base 2 



Pronotum feebly or moderately and more broadly convex, with the 

 median basal impression obsolescent and narrow 3 



2 Sides of the pronotum concave and reflexed; pubescence of the elytra 

 conspicuous posteriorly. Body elongate-oval, very convex and 

 subcylindric, slightly shining and blackish-piceous throughout; 

 head unimpressed, nearly flat, very densely and rather coarsely 

 punctate throughout, the erect hairs rather short; antennee short 

 (9), rather compressed; prothorax short and transverse, about 

 four-fifths wider than long, the subparallel sides evenly and rather 

 strongly arcuate; apex much narrower than the base, deeply sinuate, 

 the angles acute or slightly blunt at tip; basal angles moderately 

 obtuse, very distinct by reason of the small but rather deep sinuses 

 of the base adjoining them as in some of the obovatus group; surface 

 strongly and evenly convex, with a large basal impression, the bottom 

 of which is longitudinally acute, coarsely, very deeply and densely 

 punctate, with a very fine raised median line, rather abruptly and 

 deeply but not very widely concavo-explanate and similarly punctate 

 at the sides, the reflexed edge very thin; elytra oblong, parallel, 

 with feebly arcuate sides, scarcely perceptibly wider behind the 

 middle, a third wider than the prothorax and between three and 

 four times as long, two-thirds longer than wide, obtuse and very 

 declivous behind, the lobe small and feeble; surface very strongly, 

 evenly cylindro-convex, rather finely but deeply and closely, un- 

 evenly punctate, the fulvous hairs erect, fine, rather long, the 

 vestigial costules and side margin very evident, the humeral carinule 

 rather short but strong, unevenly sinuous; abdomen finely rugu'ose 

 and finely, rather sparsely punctate, somewhat shining; legs very 

 short and slender. Length (9 ) 16.5-20.0 mm.; width 7.6-9.2 mm. 

 Oregon crinitus n. sp. 



Sides of the pronotum rather narrowly deplanate, not reflexed; pubes- 

 cence of the elytra extremely short, only evident, even posteriorly, 

 when viewed tangentially to the surface. Body much shorter, 

 relatively more ventricose, very convex, black or with scarcely 

 piceous tinge; head barely at all impressed, the deep punctures 

 coarse and fine densely intermingled; prothorax relatively much 

 smaller than in crinitus and more transverse, nearly twice as wide as 

 long, nearly as in crinitus but deplanate and much more coarsely 

 punctate at the sides and with the apical angles still shorter and 

 blunter; basal impression rather smaller, much less conspicuous; 



