16 MEMOIRS ON THE COLEOPTERA 



Prothorax less abbreviated 6 



6 Form elongate, moderately convex, shining, the alutaceous areas as 

 usual; upper surface bright bronze, dull green beneath; legs nearly 

 black throughout; antennae long, very slender, the outer joints about 

 three times as long as thick; head as usual, more than four-fifths 

 as wide as the prothorax, the latter as in bifossulatum but slightly 

 less transverse and with the oblique sides more deeply sinuate be- 

 fore the angles, barely more than one-half wider than long; elytra 

 throughout nearly as in bifossulatum, the eighth stria similarly fine, 

 scarcely at all impressed and finely but distinctly punctate. Length 

 (cf) 6.8 mm.; width 2.7 mm. Unlabeled in the Levette collection 



and probably taken in Colorado regestum n. sp. 



Form broader and less elongate than in any other species, rather de- 

 pressed, shining, feebly alutaceous anteriorly, bright bronze above, 

 greenish beneath, the legs piceous-black, the coxae pale; antennas 

 long and slender, the tenth joint between two and three times as 

 long as wide, black, the basal joint very faintly rufescent beneath; 

 prothorax as in the preceding but shorter, nearly three-fifths wider 

 than long; elytra much shorter than in any other species, oblong, 

 parallel, broadly rounded at apex, the latter faintly lobed in the 

 middle as usual, two-fifths longer than wide and three-sevenths 

 wider than the prothorax, striate and finely punctate as in the pre- 

 ceding, but with the eighth stria more nearly as in cheyennense, 

 very fine but deep and groove-like and not perceptibly punctate 

 under the hand lens. Length (a 71 ) 5.5 mm.; width 2.3 mm. A 

 single unlabeled example from the Levette collection, almost un- 

 doubtedly taken in Colorado nuperum n. sp. 



The male seems to be more abundant than the female in this 

 group. The species regestum and sufflatum so closely resemble bi- 

 fossulatum, that they would inevitably be intermingled in most col- 

 lections, and the radical differences in the mentum tooth was a 

 very surprising discovery, showing how closely distinct species may 

 sometimes resemble each other to superficial view. 



In the type of sufflatum there are three very large deep equal dor- 

 sal foveae on the left elytron, occupying the same space as the usual 

 two foveae, the intermediate near the second stria, and not subaxially 

 placed on the third stria, which is the invariable rule in this group, 

 but, on the right elytron, there is no trace of any except the two 

 regular foveae. The middle fovea on the left elytron would appear 

 to be unquestionably adventitious and without special significance 

 of any kind. 



The only specimen of bifossulatum which I took at Duncan's 

 Mills, Sonoma Co., is of a dull deep black throughout above, though 

 normal beneath, and the dense opacity outside of the fourth stria 



