76 CASEY 



granules posteriorly, the clypeus rather narrowly and deeply sinu- 

 ate medially, rounded and with minute feeble emargination at the 

 sides, broadly and rather strongly reflexed except at the sinus; 

 prothorax very transverse, gradually though moderately narrow^ed 

 from base to apex, with evenly arcuate, very finely and feebly 

 beaded sides, the apical sinus broad, subtransverse at the bottom, 

 the angles moderately prominent, rounded, the basal angles pos- 

 teriorly produced but rather blunt; surface convex, alutaceous, 

 abruptly and lather widely plano-explanate at the sides, almost 

 equally throughout the length, the punctures fine and sparse medi- 

 ally, rather close, strong and setulose laterally, muricate through- 

 out though feebly so medially ; elytra about as long as wide, 

 gradually and evenly convexo-declivous posteriorly, the outline 

 evenly rounded from about basal third to the apex, which is very 

 obtusely subogival ; surface even, very convex, rather coarsely, 

 moderately closely and strongly muricate, each asperity with a 

 minute posterior puncture, micro-setigerous laterally, the asperi- 

 ties tending sometimes to arrange themselves in transverse irregu- 

 lar lines; under surface rather hairy, the epipleurs sparsely 

 punctate and fulvo-jDubescent, the abdomen nearly glabrous, finely, 

 sparsely punctulate. Length 10.5-1 2.0 mm. ; width 7-0-7-S mm. 

 Oi-egon muricata Lee. 



Form globose, large in size as in jmiricata^ posteriorly subacute, 

 black, shining; head less densely rugose than in muricata^ the 

 prothorax deeply sinuate at each side of the base as usual, the 

 sides margined, the apex and base flavo-ciliate ; surface very 

 smooth, finely granulate at the sides; elytra with the granules 

 less elevated than in niuricata and transversely confluent ; epi- 

 pleurae very densely and finely punctulate. Length 11.2 mm. 

 California (Colorado Desert) dilatata Lee. 



Form nearly as in 7}i7<ricata^ but very much smaller in size, similar 

 in color, lustre and distribution of the hairs and fringes; head 

 similar but less opaque and less completely rugulose, finely but 

 strongly punctato-granulose, densely toward the transverse suture, 

 sparsely so elsewhere; prothorax similar throughout, though 

 shorter and even more transverse, nearly three times as wide as 

 the median length, the minute and feeble punctures completely 

 wanting along the middle, finely muricate but sparse laterally, 

 the sides rather less broadly explanate ; elytra scarcely as long as 

 wide, similar in form and similarly sculptured though more ru- 

 gose, very convex and polished (?) or duller and more flattened 

 medially (cJ*), at basal third rather broader than the prothorax in 

 the former but not in the latter, where the basal angles of the 

 prothorax are more widely free ; under surface nearly similar, the 

 epipleurae finely, sparsely punctate, with the hairs very short and 

 inconspicuous. Length 8.0-8.5 mm. ; width 5.2-5.85 mm. New 

 Mexico acomana n. sp. 



3 — Form oval, convex, black, moderately shining, slightly more 



