Horn.] ^JJi [Dec. 19, 



terior margin widely reflexed. Thorax one-half wider than long, base not 

 wider than apex, sides rather broadly arcuate, margin crenate, anterior 

 angles very little more prominent than the apical margin, pubescent on the 

 inner side, limited within and posteriorly by a deep grove, posterior angles 

 smooth, auriculate, retracted within the line of the sides, and much de- 

 pressed below the level of the disc, surface moderately convex, shining, 

 punctures coarse, sparsely and irregularly placed, leaving large smooth 

 spaces. Elytra slightly convex on the disc, coarsely, deeply and closely 

 punctured. Pygidium coarsely punctured. Body beneath shining; 

 coarsely but irregularly punctured. Legs ambulatorial, anterior tibiae bi- 

 dentate near apex, the terminal tooth moderately prolonged, middle and 

 posterior tibiae stout. Tarsi as long as the tibiae, feebly compressed. 

 Length .44 inch ; 11 mm. PI. iv, fig. 7. 



This species is the only one at present known in which 

 the mentum plate is acute behind without notch, and the 

 hind angles of the thorax retracted within the line of the 

 sides. The middle and posterior tibiae are thicker or less 

 compressed than in any species of this series. It seems to 

 be the link between the groups with the entire mentum and 

 those with that organ notched or emarginate posteriorly, 

 these all having the hind angles more or less retracted. 



Two specimens, western Kansas. 



C. variolosus Kby. 



Black, slightly shining. Head coarsely and densely punctured, vertex 

 convex, clypeus arcuate, margin reflexed. Mentum plate deeply concave, 

 shining, posterior margin acutely notched. Thorax more than half wider 

 than long, sides moderately arcuate and gradually wider behind, very sud- 

 denly and rather deeply constricted in front of the hind angles, anterior 

 angles smooth, tuberculiform, completely surrounded by a deep groove, 

 hind angles smooth, somewhat triangular, projecting laterally and sepa- 

 rated from the disc by a deep impression," disc of thorax slightly convex, 

 coarsely and densely punctured. Elytra flattened on the disc, surface with 

 shallow oblong f'oveae, somewhat confluent. Pygidium coarsely punctured. 

 Body beneath very coarsely but rather sparsely punctate. Legs as in 

 squamulosus. Length .36 inch ; 9 mm. PI. iv, fig. 8. 



This species is abundantly distinguished from the pre- 

 ceding by the thoracic characters, the anterior angles being 

 more completely surrounded by a groove than in any other 

 species, in our fauna. In some specimens the median line 

 of the thorax is feebly impressed. 



Synonymous with this species are cicatricosus and Percheroni 

 "Westw. 



Occurs in the Middle States region. 



