:'..')li REVISION OF THE TKNEltKIoNID.K OF AMERICA, 



All the species exhibit some sexual peculiarity in the anterior tibiae, especially grami- 

 latus, when' the tibia becomes rather suddenly arcuate in its lower half forming thus an 

 angle between the upper and lower portion.* 



Six species of this genus are known, all from the desert regions oi California and 

 Arizona. The following table shows their differences : 



Elytra very broadly oval; disc faintly or not striate and rather densely 

 but finely muricately punctured. 

 Elytra sparsely pubescent. 



Surface uniformly dark brown or black. puberulus. 



Head and thorax ferruginous. puncticollis. 



Elytra not pubescent, sub-opaque, black. gagates. 



Elytra elongate oval or sub-parallel; disc distinctly striate or sulfate. 

 Anterior tibia' similar in the sexes. 



Ant. tibia- neither sub-angulate nor arcuate. opacus. 



Anterior tibiae dissimilar in the sexes. 



Ant. tibia & sub-angulate at middle, arcuate beneath. granulatus. 



Ant. tibia £ suddenly narrower at base. sulcatus. 



N. puberulus, Lee, Ann. Lye. V., 145. 



The tibiae id' the sexes are similar to each other, but slightly more arcuate in the male. 

 From all the other species this and the following differ in having the anterior tibia 3 very 

 broad, outer edge- and hind surface finely denticulate. The thorax is broader than long, 

 moderately convex, distinctly margined, sides feebly rounding, not converging, apex 

 emarginate, angles obtuse, base sinuate, angles distinct ; disc finely and sparsely punc- 

 tured. Elytra broadh oval, scarcely one-third longer than broad, convex, faintly striate, 

 densely finch muricately punctured, each puncture bearing a short hair. The upper 

 surface is very dark brown in color, the leers dark ferruginous. 



Length .22 inch. 



Occurs in the Colorado Desert and Arizona. 



N. puncticollis, Lee, Ann. Lye. V., 145. 



Similar to puberuhts, differs in having the head and thorax ferruginous, the latter 

 more convex, less margined, more densely and coarsely punctured. The elytra! stria- 

 are more evident, muricate punctures more distinct and abundant. 



Length .20-22 inch. 



Occurs in the Sacramento Valley, at San Jose and near Yisalia. 



* By an error of tin- pen, evidently, in tin- use of "lust " for " first, " this peculiar angulation of the tibia is ac- 

 credited to < lonibius, in the Classification of Coleoptera of X. A., p. 'J'.'T. 



