NORTH OF MEXICO. 279 



Head and thorax smooth. 



Mesostemum slightly declivous. 



Mentum very coarselj punctured, convex at middle spicul i fe r a . 



Mentum nearl} sn th,with a longitudinal median 



ridge. in u r i c a t a . 



Mesostemum and metasternum exactly on same plane, a s p e c ata. 

 I lead and thorax very coarsely punctured. \ ariolosa. 



Presternum not produced, truncate ; elytra scarcely spiculiferous. seriata. 

 Elytra striato-punctate, not at all spiculiferous, prosternum produced, 

 hind thighs distinctly granulate within. {Thorax broader Hum 

 /""!/.) i n t'a usta. 



('. spiculifera, Leo., Proc. A. .id. 1861 :i:!T. 



Our largest species, distinguished from muricaia by the greater development of the 

 spicules at the sides of the elytra near the apex, and by the difference in sculpture ol 

 mentum. The mentum is very coarsely and even continently punctured, and broadl) 

 convex along the median line, hounded on each side by an oblique shallow groove. This 

 sculpture of mentum seems to distinguish from the succeeding species, individuals as small 

 and as smooth as that species usually presents. 



I believe this species to he identical with that of Mannerheim (caraboides), bul cannot 

 settle the question definitely without a type of that species or some fuller description. 



Not rare on the peninsula of Lower ( 'alitornia. 



Length 1.08 inch. 



C. muricata, Lee, Ann. Lye. 5 110. 



Resembles the preceding, but is smaller and with much le--~ developed spicula?. The 

 mentum is smooth and with but few very distant large punctures, ami with a longitudinal, 

 more or less acute, median ridge. 



Occurs not \er\ commonly on the Deserts of the Colorado and Gila rivers. One spe- 

 cimen from Lower California. 



Length .55— .95 inch. 



('. asperata, black, moderately shining, elongate; head coarsely but not denser) punctured. Thorax 

 than broad, emarginate anteriorly, truncate posteriorly, sides broadly rounded, slightlj narrowed behind, angles sub- 

 acute, disc moderately convex, - ith and a few coarse i stures near the sides; elytra elongate oval, flattened on 



the disc, very declivous posteriorly, base truncate, humeral angles not prominent, ornamented with Beries of elevated 



tubercles, more or less acute on the disc, bet dng more acute but scarcely separate posteriorly. Mentum evenlj 



convex, very coarsely punctured. Hind thighs with a few coarse granules. Prosternum produced, broadly rounded 

 at tin. Mt'sostirnum Mat l>eneath, vertical an. I emarginate in front. 



Length .70 inch. 



Collected by Mr. W'm. M . < rabb, on the peninsula of Lower California, but one speci- 

 men obtained. 



