122 MEMOIRS ON THE COLEOPTERA 



6.3-7.0 mm.; width 2.4-2.7 mm. New Mexico (the locality un- 

 recorded) nugax n. sp. 



16 Species of the Pacific coast fauna, larger, more oval and convex, the 

 elytra much wider than the prothorax and with strongly arcuate 

 sides. Color piceous-black when mature, the under surface and 

 legs pale red-brown, the antenna slender and ferruginous; surface 

 highly polished, the elytra ( 9 ) slightly alutaceous, generally with 

 the sutural angle not or only extremely minutely denticulate; head 

 moderate, rather short, the eyes prominent as usual, the foveee very 

 small, deep, rounded and somewhat impressed; prothorax fully 

 one-half wider than long, the sides subparallel, almost evenly rounded, 

 the base but slightly wider than the apex, transverse, feebly bisinu- 

 ate, the angles rather obtuse and notably broadly rounded; apex 

 moderately sinuate, with rounded angles; surface steeply declivous 

 anteriorly to the rather fine reflexed edge, the gutter expanding but 

 slightly, inclined in plane and very feeble posteriorly, disappearing 

 near basal third, finely punctulate throughout; basal regions not 

 distinctly punctulate, the foveae narrow, very feeble and with a few 

 punctures; elytra only two-fifths longer than wide, nearly a fourth 

 wider than the prothorax, the sinus very feeble though rather evident, 

 the striae (cf ) fine and feebly impressed or ( 9 ) very fine and shallow, 

 with nearly flat intervals; accessory punctures of the abdomen 

 rather strong and asperate, somewhat numerous, tending to trans- 

 versely lineal arrangement near the apices of the segments; hind 

 tarsi not very short, slender, the basal joint two-thirds as long as the 

 fifth. Length (cf 9 ) 7.8-10.0 mm.; width 3.1-3.7 mm. Northern 

 coast regions of California. Eleven examples. .. albionicus Mann. 



Species of the Sonoran fauna, much smaller, narrower and more parallel 

 in form, the elytra (9) usually rather strongly denticulate at the 

 sutural angles and almost as shining as in the male 17 



17 Body more elongate and slender, the elytra fully one-half longer 

 than wide, circularly rounded at apex; hind femora (cf ) strongly 

 swollen. Black, highly polished, the under surface more piceous- 

 black, the legs short, uniformly dark rufous; head moderate, the 

 eyes prominent, the foveae minute and perforato-punctiform; 

 mentum tooth strong, slender and subacute; antennae slender, dusky 

 rufous; prothorax subparallel, fully one-half wider than long, the 

 sides broadly rounded, gradually less so posteriorly, the apex feebly 

 sinuate, with broadly rounded angles and barely visibly narrower 

 than the base, which is transverse, finely margined, very broadly and 

 obsoletely bisinuate and with the angles but little more than right 

 and distinctly rounded; surface with feeble transverse wavy lines, 

 the rather fine marginal gutter curving inward and expanding though 

 feeble posteriorly, vanishing at basal fourth, the foveae short, sub- 

 linear, very feebly impressed and with a few rather coarse punctures, 

 otherwise impunctate; elytra barely visibly wider than the prothorax, 

 the sinus completely obsolete; striae rather fine, feebly impressed, 

 the intervals slightly convex, the puncture very small and feeble, 

 near posterior fifth; accessory punctures fine, sparsely and very 

 irregularly distributed; hind tarsi rather short but slender, the basal 



