1873.] 417 [Horn. 



not differ notably from the specimens from this side of the Mississippi, 

 except that the summits of the thoracic vittae have become denuded. 



Occurs from Canada to Arizona. It is possible that this is the species 

 described by Gyllenhal as CBqualis, and if so it has evidently been placed 

 in the wrong Strips, and should my surmise prove correct, this name has 

 priority, and must be used in place of ochreus. 



S. discolor Mann. Bull. Mosc. 1843, II., p. 293; Schonh. Gen. Cure. 

 VIII., 2, p. 246. 



Closely allied to ochreus, differing as follows : 



Thorax regularly convex, vittae scarcely indicated, surface denuded, 

 except a narrow space at the sides, sparsely punctured, punctures at the 

 median basal region coarser and denser. Elytra almost entirely denuded, 

 rarely with the narrower intervals coated, striae moderately deep, coarsely 

 and rather closely punctured. Body beneath entirely coated. Length 

 .48-.G4 inch ; 12-16 mm. 



Male. — Abdomen longitudinally concave, not villous. 



Female. — As in ochreus. 



S. pictus Lee. Proc. Acad. 1858, p. 80. 



Thorax coated, vittte distinctly limited by punctures, and deprived of 

 coat, surface sparsely punctured, over the entire surface, and not denser 

 at base. Elytra entirely denuded except the entire second, the fourth and 

 sixth at base and the lateral region. Pygidium sparsely and less 

 coarsely punctured than in the two preceding species. Length .64 inch ; 

 .16 mm. 



Sexual characters as in ochreus. The elytral striae are fine, finely and 

 distantly punctured, the intervals flat, punctulate with the tendency to 

 alternation of puncturing almost obliterated. 



One specimen, Vallecito, California. 



One other character may be noted as separating these species from 

 those of the next group, with which I suspect ochreus, has been con- 

 founded. The thoracic vittae are entire, and the lateral does not send a 

 branch from the outer side to the base. 



Group IV. 



The third joint of the anterior and middle tarsi are dilated and pube- 

 scent at the sides, the hind third tarsal joint is usually conical, very 

 rarely feebly dilated, and at the sides sparsely fimbriate. 



From the characters of the table, this group can only be confounded 

 with the preceding, in the former, however, the natural glabrous coat is 

 always present, here never. The lateral carina of the thorax at basal 

 half is here always bifid, that is, sends a branch from its middle which 

 attains the hind angle of the thorax. In the next group the tarsi are 

 slender, and sparsely fimbriate, never pubescent at the sides. 

 a. p. s. — yol. xiii. 3a 



