NORTH OF MEXICO. 3ol 



N. gagates, entirely black, sub-opaque. Head denselj and finely punctured; margin of epistoma paler. Thorax 

 broader than long, convex, densely and finely punctured, sides feebly rounded, narrowing slightly toward base; apex 

 emarginate, angles distinct; base rounded, angles obtuse. Elytra broad, convex, densely and minutely punctured. 

 Beneath black, shining, sparsely punctured. 



ili .'.'I .28 inch. 



This species with the tahle needs bul little description; it differs from those with 

 broadly oval elj tra in its being totally black, thorax narrower at base, base rounded, apical 

 angles distinct, no! obtuse. The elytra are less rounded on the sides, the humeri distinct. 

 There arc no elytral stria' and the punctures arc very minute and irregularlj placed. The 

 anterior tibiae also, arc narrow, not broad, as in the two preceding species. 



Occurs in moderate abundance at Camp Grant, under stones, and when recent is 

 pruinosi . 



X. opacus, Lee, New Species, p. lis. 



The thorax i- less transverse than in the broad species which precede, i- more convex 

 and is also narrower at base and nan-ewer than the base of the elytra. The elytra are 

 elongate oval, rounded on the side-, with distinct humeral angles, surface striate, striae 

 punctured, intervals feebly convex and finely punctured. The head and thorax are very 

 densely and continently punctured with elongate punctures. 



Length .20-.24 inch. 



The measurement given by Leconte (loc. cit.) is probably a mistake, as his type is 

 ■half longer at least than indicated (.12 inch). 



The anterior tibiae are here also similar in the sexes, and are verj gradually wider 

 from the Base toward the apex. 



Occurs in Arizona and Lower California. 



N. granulatus, Lit.. Ann. Lye. V.. 145. 



\\ hile similar in form to opacus, this species has the thorax broader and less narrowed 

 behind, the surface is densely and coarsel) punctured. The elytra arc deeply striate, the 

 striae closelj punctured, the interstices convex and muricately punctured. The anterior 

 tibiae of the males serve to distinguish this species from any other. From the base to the 

 middle these tibiae are very gradually wider, below the middle the tibiae are suddeuly ar- 

 cuate, causing them to appear toothed. The tibiae of the female are gradual!) expanded 

 toward the apex and are broader than the male. 



I . ngth .1 S -.'J"> inch. 



Occur- at Fort Yuma and Arizona. 



X. Bulcatus, I. re.. Ann. Lye. V.. 145. 



The thorax is sub-quadrate, not narrower behind, sides feebly rounded, almost parallel 

 behind the middle. The elytra arc elongate oval, sub-parallel, deeply striate, stria? co irselj 



AMKRI. PHILOSO. BOO. — VOT.. XIV. — 90 



