98 MEMOIRS ON THE COLEOPTERA 



smooth to minutely punctulate toward tip; elytra very short, 

 quadrate, about as wide as long, rapidly very obtusely rounded in 

 less than apical third, a fourth wider than the prothorax, the parallel 

 sides feebly arcuate; humeri obtuse but distinct; surface with the two 

 discal double lines rather coarsely impressed; punctures coarse 

 but feebly impressed almost throughout the broad second interval, 

 elsewhere smaller though not very fine, sparse and feebly impressed, 

 the general surface somewhat rugose but not at all conspicuously; 

 lateral impressions rather shallow and linear; pygidium green, rather 

 shining, loosely rugulose and with long, erect and plentiful pubes- 

 cence; mentum concave anteriorly as usual in the genus; legs rather 

 slender. Length (cf) 13.6-14.8 mm.; width 8.2-8.6 mm. Utah 



(Stockton). Three examples pubicollis n. sp. 



Body larger and more elongate-oval, more convex; coloration throughout 

 similar, except that the anterior parts above are pure green in lustre 

 and not blue, though, rarely, the pronotum becomes bluish toward 

 the sides, differing principally in the coarser, less silky vestiture, 

 the long hairs covering the entire elytra conspicuously in the female, 

 but restricted more to the inner parts in the male; the surface exter- 

 nally becoming almost glabrous; head densely punctate, the semicir- 

 cular clypeus finely and feebly reflexed peripherally, flat, deep black 

 ( 9 ) or green (cf), always with much shorter pubescence than the 

 other parts; prothorax twice as wide as long, nearly as in the pre- 

 ceding but more narrowed and more deeply sinuate at apex, the erect 

 hair? less dense and less white; scutellum punctured throughout; 

 elytra distinctly longer than wide, fully a third wider than the pro- 

 thorax, more oval, circularly rounded in about apical half, the parallel 

 sides broadly rounded; punctures everywhere coarse and rather 

 deeply impressed, not differing internally except that they are less 

 sparse toward the suture than externally, the two geminate lines 

 more coarsely and deeply impressed in the male than in the female; 

 pygidium green to bluish, loosely but rather sharply rugulose and 

 with long abundant hairs throughout; legs blue-black; abdominal 

 punctures strong and close-set, shining; mesosternal process narrow 

 and feebly developed. Length (cf 9 ) I3-5-I7-5 mm. ; width 8.0-10.3 

 mm. Utah to Oregon (Buck Mountain). Common. [Cotalpa 

 granicollis Hald.] granicollis Hald. 



The smaller measurements under granicollis refer to an excep- 

 tionally small female example; the species differs greatly from 

 pubicollis in the character of the pubescence, in the less abbreviated 

 prothorax and longer, more apically rounded, more pubescent and 

 much more coarsely punctured elytra. 



In the genus Pocalta, the head is notably small throughout and 

 the elytral pubescence is always sparser and more restricted to the 

 medio-basal parts in the male, than in the female. The mandibles 

 are flat and lamellate and have no trace of a tooth projecting from 

 the lower surface, occasionally evident in Cotalpa. 



