272 TIIK CANADIAN ENTOMOLOGIST. 



The Utah species, C. echo, Csy., occurs also at Amedee, Cal., in a 

 form differing only in its larger size, stouter build and evidently larger 

 head ; this form can, however, be recognized as differing from the Utah 

 types and may be named Amadeensis (n. subsp.). Length, ? , 125 mm.; 

 width, 5.2 mm. Pseudosenilis, VV. Horn, is a very evident subspecies, 

 occurring in Inyo Co., Cal. Echo is an isolated species, and not a sub- 

 species of Willistoni as stated by W. Horn, differing in its minute labral 

 tooth, sculpture and form of the maculation, among other features, 

 Depressula is also an evidently valid species, and not a subspecies of 

 Oregona as intimated by W. Horn. 



The ful lowing is a subspecies of depressula : 



C. scafiularis, n. subsp. — Form stouter than in depressula and even 

 more strongly depressed, almost similar in coloration, though rather darker 

 and more obscure in the type, similar in sculpture and in its bald strigilate 

 front, but with the elytral punctures still coarser, deeper, denser and more 

 strongly nitidoasperate ; labrum ( £ ) differing noticeably from that of the 

 male of depressula, being piceous and not straw-ytllow, and with the apex 

 medially, not evenly arcuate with a minute, prominent median tooth, but 

 approximately and feebly bilobed, the lobes separated by a small acute 

 tooth that does not project beyond them ; basal joint of the antennae 

 rather more inflated ; prothorax larger, fully as wide as the head, two- 

 fifths wider than long, obtrapezoidal, with the sides perfectly 

 straight throughout ; elytra with a well-developed pale spot on the 

 humerus, the others nearly as in depressula, except that the apical is 

 larger and more prolonged ; under surface not green as in depressula, but 

 deep violaceous-blue, hairy toward the sides. Length, q* , 13.5 mm.; 

 width, 5.3 mm. California. 



This subspecies is very well differentiated and may prove to have 

 higher taxonomic value ; it somewhat resembles Sierra, Leng, in form 

 and outline, but lacks any trace of the frontal punctures and pubescence 

 of that species. 



A form of senilis, differing in sculpture, form of the humeral lunule 

 and other characters, is the following : 



C. exoleta, n. subsp. — Moderately stout and convex, shining, the 

 elytra duller, cupreous, with blue spots and transverse impressions 

 anteriorly, the elytral punctures blue, the lateral border greenish ; under 

 surface blue-green ; head nearly as in senilis, the labrum similarly with 

 large discal punctures ; prothorax obtrapezoidal, with straighter sides, the 



