AMERICAN COLEOPTERA. 171 



The figure given by Lacordaire is not characteristic, and T place 

 that species here because the deep and coarsely punctured fovese of. 

 the thorax are mentioned; palj)alis Motsch., is not so described that 

 it can be placed certainly in synonymy, but as the choice is between 

 this and stenostomus it does not much matter where it is put as it is 

 the youngest name in the entire synonymy. C. Schaumi Chd., belongs 

 more especially to the var. nitidicolUs, while granulosus is Brevoorti. 



C (Sphaeroderus) stenostomns "Weber, Obs. Ent. p. 43 ; Knoch, Neue 

 Beitr. i, p. 190, pi. 8, fig. 13; var. Lecontei Dej., Species ii, p. 15; Lee. Ann. Lye. 

 iv, p. 442; var. bicarinatus Lee, Trans. Am. Philos. Soe. 1853, p. 399. — Thorax 

 broader than long, sides arcuate, slightly oblique posteriorly, hind angles 

 obtuse, basal transverse impression moderate, the longitudinal impressions 

 rather sharply defined and moderately elongate, with very few punctures. 

 Length .48— .60 inch ; 12—15 mm. 



These characters are the only ones capable of use for the separation 

 of this and the preceding species, and it is moreover extremely diflScult 

 to determine at times whether specimens should be called Lecontei 

 or Brevoorti. 



The following are the variations : 



var. stenostomus Weber. — Elytra oval, moderately convex, surface striate, 

 striae deep and with deep closely placed punctures, intervals convex, entire on 

 the disc, very slightly confused at the sides and near the tip. 



var. . — Elytra as above, intervals interrupted in the apical region 



one-third from apex, but without becoming granulate. 



var. Lecontei Dej. — Intervals interrupted from the middle to the apex, at the 

 apical third the interruptions assume the form of tubercles often elongated. 



var. bicarinatus Lee. — Intervals interrupted except in the basal region, near 

 the apex the tubercles forming three series of larger tubercles with the inter- 

 vals filled with granules, on each elytron the intervals four and eight somewhat 

 elevated the twelfth forming quite an elongate carina. 



After a careful study of the above forms it seems to me impossible 

 to separate them specifically, and I am prepared to say that the differ- 

 ences in elytral sculpture have no value as they merge insensibly from 

 one form into another. 



Occurs from Michigan to North Carolina. 



C. (Sphaeroderus) canadensis Chaud., Bull. Mosc. 1861, ii, p. 498. — Moder- 

 ately elongate, violaceous, margin bluish. Thorax slightly wider than long, 

 sides in front arcuate, posteriorly oblique, hind angles distinct, basal transverse 

 impression feeble or entirely wanting, longitudinal impressions moderately 

 long, sharply defined and with very few punctures. Elytra oval, surface 

 deeply striate, striae crenately punctured, intervals convex, slightly inter- 

 rupted at the sides, more distinctly at apex, but not tuberculate. Length 

 .44— .48 inch ; 11—12 mm. 



This species seems quite distinct from the others by the hind 



