30 AMERICAN COLEOPTERA. 



the thorax and more than one-half longer than wide, deeply striate; humeri 

 rounded; strise punctate, the punctures becoming obsolete toward the apex, 

 entire, the seutellar stria moderately long, the eighth with the row of ocellate 

 punctures widely interrupted at middle; intervals nearly flat. Body beneath 

 dark piceous or black; sides of metasternum, meso- and metasternal episterna 

 and sides of first two ventral segments punctate. Legs varying from nearly 

 black to rufopiceous; middle and hind femora with two setigerous punctures 

 along the inner margin ; three basal joints of the posterior tarsi feebly grooved 

 on the outer side. Length .3S-.42 inch ; 9.5-10.5 mm. 



The males have the middle tibiae normally dentate. 



This species approaches melanogastrica very closely, and, indeed, 

 seems doubtfully distinct. The chief points of difference are attbi-ded 

 by the prothorax, which is slightly less distinctly emarginate at 

 apex in the present species, with the side margin narrower and not 

 translucent and the fovese of the basal impressions slightly oblique. 

 The antennae differ slightly in color, while the elytra are usually 

 paler iji melanogastrica than in eschschoUzi. 



It occurs in Alaska and Kamchatka. 



14. A. melanogastrica Dej. — Form nefir]y ns \i\ eschschoUsi. Color dark 

 piceous or black, the elytra usually brownish. Head nearly as wide as the 

 tho7ax at apex ; frontal grooves short, moderately deep, not extending anteriorly 

 on to the epistoma ; antennse slender, slightly shorter than the head and thorax, 

 rufous; palpi rufous. Prothorax subquadrate, about one-half wider than long, 

 as wide at ba-se as apex, punctate at base and more sparsely so at apex; apex 

 emarginate, the anterior angles rounded ; transverse impressions nearly obsolete; 

 median line fine, abbreviated in front; basal impressions broad, deep, bifoveate, 

 the foveiE perpendicular to the base, the inner longer than the outer; base trun- 

 cate ; sides with the margin narrowly reflexed but distinctly translucent, rounded, 

 slightly sinuate in front of the hind angles, which are rectangular, slightly 

 prominent and obtusely carinate. Elytra together slightly wider than the 

 thorax and less than twice as long as wide, subparallel, deeply striate ; humeri 

 rounded ; striae distinctly punctate, obsoletely so at apex ; intei'vals nearly flat ; 

 inflexed portion of the elytra somewhat paler. Body beneath nearly black; 

 meso- and metasternal episterna and sides of metasternum and of the first two 

 ventral segments punctate. Legs usually rufous, varying to piceorufous; middle 

 and hind femora with two setigerous punctures along the inner margin ; three 

 basal joints of the posterior tarsi grooved externally. Ijcngth .38. 44 inch : 

 9.5-11 mm. 



In the males the middle tibiae are normally dentate on the inner 

 side. 



Very closely allied to the pi'eceding, fi'om which it differs by only 

 a few characters of doubtful value. The prothorax is slightly more 

 deeply eniarginate at apex, with the side margin, although luirrow, 

 wider than in eschscholtzi and translucent, while the fovere of the 



