NORTH OF MEXICO. 



279 



Head and thorax smooth. 



Mesosternum slightly declivous. 



Mentum very coarsely punctured, convex at middle, spiculifera. 

 Mentum nearly smooth, with a longitudinal median 



ridge. m u r i c a t a . 



Mesosternum and metasternum exactly on same plane. asperata. 

 Head and thorax very coarsely punctured. variolosa. 



Prosternum not produced, truncate ; elytra, scarcely spiculiferous. s e r i a t a . 

 Elytra stria-to-punctate, not at all spiculiferous, prosternum produced, 

 hind thighs distinctly granulate within. (Thorax broader than 

 long.) in fans ta. 



C. spiculifera, Leo., Proo. Acad. 1861-887. 



Our largest species, distinguished from mwicata 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 confiuently punctured, and broadly 

 convex along the median line, bounded 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 be identical with that of Mannerheim (caraboides), but cannot 

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

 Not rare on the peninsula of Lower California. 

 Length 1.08 inch. 



O. murioata, Lee, Ann. Lye. 5-142. 



Resembles the preceding, but is smaller and with much less developed spicule. The 

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

 more or less acute, median ridge. 



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

 cimen from Lower California. 



Length .55-.95 inch. 



C. asperata, black, moderately shining, elongate; head coarsely but not densely punctured. Thorax longer 

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

 acute, disc moderately convex, smooth and a few coarse punctures near the sides; elytra elongate! oval, flattened on 

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

 tubercles, more or less acute on the disc, becoming more acute but scarcely separate posteriorly. Mentum evenly 

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

 at tip. Mesosternum Hat beneath, vertical and emarginate in front. 



Length .70 inch. 



Collected by Mr. Wm. M. Gabb, on the peninsula of Lower California, but one speci- 

 men obtained. 



