THE CANADIAN ENTOMOLOGIST. 275 



C. lumidi/rons, n. subsp. — Similar in general to the preceding but 

 more shining, green above, blue and green beneath ; head more broadly 

 granulose along the middle, the front transversely and abruptly elevated 

 above the vertex, with the median part of the anterior slope smooth and 

 minutely, sparsely punctulate ; labrum similar, except that the feebly 

 trilobed advanced j>art is fully two-thirds the total width; prothorax much 

 less transverse and with less rounded sides, only just visibly wider than 

 long, the lateral marginal line, much more evident and the anterior trans- 

 verse impression deeper ; elytra and tarsi nearly similar throughout. 

 Length, $ , 9.5 mm.; width, 3.6 mm. Mexico (Chihuahua). 



C. aterrima, n. sp. — General organization as in the two preceding 

 but much more elongate, alutaceous, deep black above and beneath, the 

 latter shining ; legs deep black, not at all metallic ; head finely strigilate 

 almost throughout, subeven, the front feebly swollen as usual, bald ; 

 labrum as in Ji/itarsis, but with the median trilobed projection a little 

 wider; prothorax wider than long, obtrapezoidal, with nearly straight sides, 

 having a very few short hairs laterally, the marginal line subobsolete, the 

 impressions rather feeble ; elytra parallel, similar but much more elongate, 

 immaculate and with the punctures almost obsolete ; tarsi not quite so 

 slender. Length, £ , 10.0 mm.; width, 3.75 mm. Mexico (Chihuahua). 



Although aterrima is of the same general type as the two preceding 

 forms, it would be a rather remarkable and very instructive fact if its 

 status should prove to be anything less than specific. 



CARABID^E. 

 Omophron, Latr. 

 The following are a few species and subspecies which have been 

 undescribed in my cabinet for some years : 



O. grossum, n. sp. — Body very large and stout, moderately convex 

 and shining; head throughout and mandibles pale, the latter black 

 apically, the clypeal suture finely infumate, a small transverse piceous 

 cloud on the vertex basally ; surface wholly impunctate, except a few 

 punctures scattered along the base ; antennae slender ; prothorax but 

 slightly more than twice as wide as long, the sides more parallel than 

 usual and very discontinuous with those of the elytra, gradually rounding 

 and feebly converging anteriorly, the surface with a central green 

 parallelogram in median two-fifth?, narrowly prolonged medially to the 



