H2 MEMOIRS ON THE COLEOPTERA 



slightly wider than the prothorax, parallel, with feebly arcuate sides, 

 as in ellipsis throughout, except that the apex is more ogival and 

 less broadly obtuse and the sinus feebler, being almost obsolete, 

 the small puncture similarly near apical fourth, the tarsi similar. 

 Length (cf) 9.0 mm.; width 3.6 mm. Arizona (probably southern). 



vespertinus Csy. 



Body larger, more elongate-oblong and more convex, deep shining black 

 above and beneath, the tarsi rufo-piceous; antennae slender, dark 

 testaceous; head apparently not quite one-half as wide as the 

 prothorax, nearly as in the preceding throughout; prothorax two- 

 fifths wider than long, the sides subevenly and rather feebly rounded, 

 more rounding and converging apically, nearly parallel basally, the 

 apex deeply sinuate, with subprominent though rounded angles and 

 much narrower than the base, which is rectilinear and finely mar- 

 gined, the angles right but broadly rounded; surface almost perfectly 

 even throughout, the fovese as nearly obsolete as possible, barely 

 traceable by oblique illumination, the sides but slightly modified, 

 though the latero-basal region is very slightly flattened, somewhat 

 alutaceous and with some feeble anastomosing rugulosity; disk also 

 with some feeble wavy transverse lines, the stria fine and feeble; 

 elytra fully one-half longer than wide, about equal in width to the 

 prothorax, parallel and feebly arcuate at the sides, the striae (cf ) 

 rather fine but deep, slightly impressed, the intervals feebly convex, 

 polished, the scutellar stria long, the puncture small and before 

 apical fourth; basal joint of the hind tarsi equal in length to the 

 fifth, the first three decreasing uniformly and not very rapidly in 

 length as in the allied species. Length (cT) 9.8 mm.; width 3.6 mm. 

 Colorado (Boulder Co.) mobilis n. sp. 



The last section, with small head, Celia-like facies and obsolescent 

 pronotal foveae to which paululus does not strictly belong, being 

 placed there solely on account of the unusually small head, would 

 seem to be at least subgenerically different from the more typical 

 Harpalus, but there are no obvious structural peculiarities war- 

 ranting the separation, other than those mentioned; the absence 

 of a mentum tooth similarly characterizes many true Harpalus 

 species, such as herbivagus and fallax. The above description of 

 megacephalus is taken from the original, as I do not seem to have 

 that species in my collection. There are also a number of other 

 species unknown to me, that apparently belong to this viduus group 

 according to LeConte; these, accompanied by descriptions drawn 

 directly from the originals, are as follows: 



H. fulvilabris Mann. Oblong, black; prothorax short, wider than 

 long, subquadrate, slightly narrowed behind, evidently canaliculate 

 medially, the base obsoletely foveolate at each side, finely and, about the 

 foveae densely, punctulate, all the angles rounded; elytra striate, shining 



