12 MEMOIRS ON THE COLEOPTERA 



lines; elytra nearly similar but more convex, the rather coarse deep 

 punctures more close-set, generally contiguous externally; coriaceous 

 genital segment (9) more deeply emarginate, the diverging corneous 

 processes behind it larger. Male unknown. Length 16.5 mm.; width 

 6.3 mm. California (Shasta Co.). 



The female type presents a distinctly different appearance from 

 the female of shastanicus, having much heavier anterior parts and 

 the truncate labrum, larger eyes and still longer antennae are suf- 

 ficiently distinctive. 



Omus shastanicus ssp. tenuiculus nov. Much smaller and more slender 

 than shastanicus, with smaller and smoother head, the rugulosity almost 

 obsolete and the anterior punctures minute and remote; labral lobe 

 prominent and evenly rounded; antennae notably long and slender; eyes 

 similar; prothorax smaller though distinctly wider than the head, similar 

 in general form and in the nearly smooth opaculate surface, but more 

 nearly as long as wide and differing in having its widest section much 

 nearer the apex; elytra much narrower, elongate-oval, the humeri simi- 

 larly very broadly rounded; punctures relatively even coarser, deep, well 

 separated; interstices not punctulate and rather shining; anterior tarsi 

 (cf) less dilated, the third joint much smaller and subquadrate. Female 

 unknown. Length 13.0 mm.; width 4.8 mm. California (Shasta Co.). 



This form is so distinct in its small anterior parts, especially 

 small head and in the outline of the prothorax, form of the male 

 tarsi, small size, slender form and in other ways, that its full specific 

 status is more than probable, but I leave it as stated provisionally. 



Group II (californicus) 



I was rather surprised to find three very distinct new forms in this 

 group, in the material from Mr. Fuchs' collection, and, also included, 

 was an additional example of mitnus Csy.; near sculptilis and the 

 closely related mimus the following distinct form should be placed : 



Omus semilucens n. sp. Male even narrower and more elongate than 

 in mimus, the elytra very shining; head slightly narrower than the pro- 

 thorax, very coarsely and deeply rugose, the impressions large, rather 

 deep, the front medially rugose, not punctate; labrum truncate, feebly 

 bisinuate; antennae rather long, moderately slender; prothorax relatively 

 rather large, wider than long, the sides rounded from apex to base, more 

 converging basally; surface coarsely, deeply, vermicularly rugose; elytra 

 nearly twice as long as wide, only a fourth wider than the prothorax, the 

 sides evenly, very broadly rounded, not more rounding at the humeri; 

 punctures moderate though deep, widely separated throughout, the 

 foveae not large but very deep and conspicuous; basal joint of the anterior 

 tarsi not quite as long as wide, the second nearly one-half wider than long. 

 Length (c^ 1 ) 14.5 mm.; width 5.1 mm. California (San Francisco Co.). 



