Horn.] dJ4 [Doc. Id. 



differs in the following characters: Disc of thorax more convex, hind 

 angles "much retracted, separated from the surface of the thorax 1 > v a deep 

 impression, and depressed beneath it. Length .44-.4S inch; 11-12 nun. 

 Plate iv, fig. 10. 



The characters separating this species from canaliculatus 

 are those in which it agrees with castane.ee from which the 

 form of the anterior angles will distinguish it, the present 

 species having the front angles of the first and the hind 

 angles of the second. 



Two specimens, Iowa and Texas. 



Synonymous with this is Walshii Westw. 



C. castaneae Knoch. 



Piceous, feebly shining. Head coarsely and densely punctured, front 

 convex, clypeus arcuate in front, sides broadly rounded, margin retie.xed. 

 Mentum plate deeply cupped, the margin widely retiexed except in front, 

 hind margin deeply emarginate. Thorax nearly twice as wide as long, 

 sides moderately arcuate and slightly coarctate iu front of the hind angles, 

 anterior angles tuberculiform, limited within by the usual deep fovea; and 

 posteriorly by an impressed line, hind angles triangular punctured at base, 

 tips turned outward, separated completely from the surface of the disc by a 

 deep impression, disc moderately convex, coarsely and closely punctured, 

 median line sometimes feebly impressed. Elytra moderately fiat, surface 

 with large shallow foveas. Pygidium very coarsely punctured. Body be- 

 neath coarsely and sparsely punctured, abdomen with very few punctures. 

 Legs as in nitens, but with the tibiae a little less thickened. Length .40 

 inch ; 10 mm. 



Tli is species is known among those of the present group 

 by the nodiform front angles which are separated from the 

 disc by the transverse impression, the hind angles are also 

 completely surrounded by a groove, and become depressed 

 below the level of the disc. 



C. Lecontei Westw. is merely a feeble form of this species, 

 and is found in the more western regions. 



Occurs in the Middle States region, extending westward 

 to Colorado. 



C. Hairisii Kby. 



Piceous, moderately shining. Head very coarsely and deeply punc- 

 tured, front convex, clypeus arcuate, angles broadly rounded, margin re- 

 tiexed. .Mentum plate deeply concave, margins retiexed, more strongly 

 at the s'des and posteriorly, the posterior margin rather broadly and deeply 

 notched. Thorax more than one-half wider than long, sides very feebly 



