American Caraboidea 163 



collis Fall, from southern California, Arizona and Nevada; then I 

 described demens, from southern Nevada, and the following is 

 still another related species: 



Calosoma pertinax n. sp. — Rather slender and convex, deep shining 

 black throughout, without trace of metallic lustre, except a feeble bluish 

 tinge on the sixteenth interval, from slightly before the middle to the 

 apex, this interval only in the metallic part bearing a regular series of 

 small subasperate punctures; head three-fifths as wide as the prothorax, 

 the eyes well developed and very prominent; surface with coarse and 

 well spaced punctures, becoming smaller anteriorly and on the neck, 

 having anteriorly two feeble longitudinal impressions, the epistoma not 

 definitely impressed medially, the lateral sulci large, deep and perfectly 

 smooth; mandibles slender, regularly arcuate -and very densely rugose; 

 antenna; longer than the head and prothorax, the latter three-fourths 

 wider than long, angularly prominent at the sides medially, thence 

 arcuate anteriorly and straight, sometimes slightly crenulate posteriorly, 

 the angles oblique, narrow and very acute; base feebly arcuate, slightly 

 narrower than the apex; surface finely, remotely punctulate and feebly 

 creased, becoming coarsely punctate or rugose medio-apically and more 

 broadly toward base; edges feebly reflexed, the foveae large but only 

 very feebly impressed; median stria well impressed, subentire; elytra 

 nearly three-fourths longer than wide, four-fifths wider than the pro- 

 thorax, very slightly wider behind the middle than at base; humeri 

 rapidly rounded, the edges basally with four or five long and very feeble 

 serrules; surface micro-reticulate, finely, feebly striate, the stria; with 

 small punctures, which are transversely connected by very coarse deep 

 grooves, delimiting medio-posteriorly prominent tegulae in a large sub- 

 basal region, the transverse lines posteriorly gradually feeble, then only 

 visible along the middle of the intervals as fine punctulation; fovese very 

 small, sometimes metallic-green; anterior male tarsi moderately dilated, 

 the third joint two-thirds wider than long. Length (cf) 20.5 mm.; 

 width 9.0 mm. New Mexico (Albuquerque),— Snow. 



The largest of these three species is parvicollis, having the epi- 

 stoma impressed in the middle from apex nearly to the base, the 

 anterior male tarsi more dilated, with the third joint twice as wide 

 as long and the extreme tip of the abdomen rugose. In clemens 

 the anterior male tarsi are much more narrowly dilated, the third 

 joint only one-half wider than long, the abdominal tip feebly rugu- 

 lose and the epistoma more narrowly impressed in the middle to a 

 little behind the centre. In pertinax the corresponding characters 

 are mentioned above; the abdominal apex is nearly smooth, finely 

 punctate, with the usual four setigerous punctures. In clemens 

 the angles at the sides of the prothorax are less acute than in the 

 other two, and in pertinax the prothorax is shorter than in parviceps 



