Horn.] 41() [Sep. 19, 



known to me, nor do I find any description of a similar species. It may 

 however be described, and I qnote the name that the synonymy may be 

 determined.* 



Occurs in Sonora, southern California and Mexico. 



Group III. 



This group contains species of moderately large size, all characterized 

 by the presence of a natural glabrous coating, which may be more or less 

 removed by abrasion, and is sometimes almost entirely lost on the upper 

 surface, but always exists beneath. The third tarsal joint, of all the 

 feet, is dilated and densely pubescent beneath, excepting a median 

 space. 



The species are as follows : 

 Body above densely clothed with a glabrous natural coat, disc of 

 thorax flattened, three vitta3 distinctly indicated. Abdomen 



% sparsely hairy along the middle ochreus. 



Body above almost entirely denuded. Abdomen % glabrous. . . . 



Stria? of elytra coarsely punctured discolor. 



Striae linely and distantly punctured pictus. 



These species are exactly similar in form, and very closely allied. 



S. ochreus Lee. Proc. Acad. 1858, p. 83 ; tmqualis, Gyll. Schonh. Cure. 

 IV., p. 941. 



Body black, entirely covered with a natural glabrous coat, varying in 

 color from pale ochreous to plumbeous. Rostrum as long as three- 

 fourths of the thorax, compressed, slightly broader at tip, sparsely punc- 

 tured, at base very finely grooved, between the eyes a moderately deep 

 impression. Thorax longer than wide, apex slightly constricted, ante- 

 riorly rapidly broader to apical fourth, sides thence sub-parallel, base 

 feebly bisinuate ; disc sub-depressed, with three entire vittse indicated, 

 surface sparsely and coarsely punctured between the vittaj, punctures 

 coarser at base, vittas minutely punctulate very rarely denuded. Scutel- 

 lum sub-sulcate. Elytra slightly broader behind the base gradually nar- 

 rowed to tip, surface finely striate, striae moderately, coarsely punctured, 

 iutervals flat, alternately broader, the broader intervals bi- or tri-seriately 

 punctulate, the narrow uniseriately, and with coarser punctures, the 

 broader intervals frequently darker in color. Pygidium coarsely punc- 

 tured and with a slight tuft of hairs at each side of the tip. Body 

 beneath and legs sparsely punctured and coated. Length .44-.G8 inch ; 

 11-17 mm. 



Male. — Metasternum and abdomen broadly concave, the latter sparsely 

 villous along the middle. Femora beneath, and tibiae within sparsely 

 fimbriate with yellowish hairs. 



Female. — Abdomen convex, not villous, legs less fimbriate. 



This species varies as above indicated in the color of its glabrous coat, 

 from pale ochreous to plumbeous and cinereous. The type specimen does 



* I have since been informed by M. Aug. Salle, that this is merely a Catalogue name. 



