158 MEMOIRS ON THE COLEOPTERA 



very distinct, deep and decidedly sparse, varying slightly in size; 

 abdomen rather shining but minutely, closely sculptured; legs very 

 much shorter than in fastigiosus and still more slender. Length (cf) 

 18.0 mm.; width 8.2 mm. Nebraska, Warren Knaus. 



globicollis n. sp. 



It is highly probable that the form assigned above as a subspecies 

 of inhabilis has in reality somewhat greater weight, but, as there are 

 only three females of both forms at hand, it may be held to be a 

 subspecies for the present. There is some difference in the con- 

 vexity of the eyes between inhabilis and retusus, which may be 

 important taxonomically. The difference in the length of the legs 

 between fastigiosus and globicollis is a very striking character. 



Group VII Type obovatus Lee. 



The various species, subspecies and perhaps other forms still 

 less advanced in differentiative evolution, here become very numer- 

 ous and troublesome, both in denning and recognizing from even 

 the most carefully prepared descriptions. Although the outline 

 of the body, with the obovately inflated elytra, is nearly as in the 

 preceding group, the eyes are very short and transverse and the 

 antennae scarcely compressed except distally, conforming to the 

 usual condition in the genus in these respects, and the body is always 

 notably less convex. The group is abundantly diffused over the 

 southern Rocky Mountain region, extending to the eastward into 

 Kansas and New Mexico. It has never been found in California, 

 so far as known to me. The assumed dichotomous characters in 

 the following table are rather feebler than in any other group of the 

 genus. The male seems to be more abundant than the female as 

 a rule. 



Sides of the elytra rounding to straight toward base 2 



Sides of the elytra broadly sinuate toward base, giving the hind body a 



somewhat pyriform outline 1 1 



2 Large and very stout species, always deep black when mature 3 



Smaller or less dilated species, usually in great part rufo-piceous in color. .4 

 3 Body deep black, rather dull in lustre throughout; head very feebly 

 impressed near each side of the front, rather strongly but sparsely 

 punctate, with minute punctures intermingled as usual; antennae 

 well developed; prothorax about two-thirds as wide as the elytra, 

 two-fifths wider than long, moderately convex, with a small and 

 very feeble, medially divided flattening toward the middle of the 

 base, finely, sparsely punctulate, the sides abruptly and distinctly 



