1873.] 41d [Horn. 



S. vomerinus Lee Proc. Acad., 1858, p. 81. 



Black, sub-opaque or very feebly shining. Rostrum slightly longer 

 than half the thorax, moderately robust, compressed, upper edge sparsely 

 punctured at base, very finely grooved and with an impressed puncture 

 between the eyes. Thorax longer thau wide, somewhat variable in form, 

 usually oblong rarely sub-quadrate, sides very feebly, base less arcuate, 

 surface equally punctured over the entire surface, rarely with an obso- 

 lete smooth median space, punctures coarser at the sides and base, and 

 also more dense before the scutellum. Scutellum smooth, not channeled. 

 Elytra broadest slightly behind the base, and gradually narrower to apex, 

 surface deeply striate, strise distantly punctured, intervals flat, sub-equal, 

 sometimes alternating and coarsely uui- or bi-seriately punctured. Py- 

 gidium coarsely and at apex sub-confluently punctured. Body beneath 

 sparsely punctured. Length .24-. 38 inch ; 6-9 mm. 



Var baridioides. Elytral intervals sub-equal, uni-seriately punctured. 

 The sexes do not differ remarkably. The tibia? are very sparsely fim- 

 briate within and the anterior are feebly sinuate. The sub-apical spur 

 is moderate. 



The elytral intervals vary in the degree of punctuation and also in 

 width. In the typical form the intervals are slightly alternately broader, 

 and the narrower space distinctly uni-seriately punctulate, and the 

 broader intervals bi-seriately or even confusedly punctured. In the va- 

 riety baridioides the intervals are equal and uni-seriately punctulate 

 with coarser punctures thau in the preceding variety. These latter seem 

 almost entitled to rank as distinct species, but every necessary link be- 

 tween the two forms exists. The legs are sometimes rufous. 



Colorado, Arizona, and California east of the Sierras. 



S. Ulkei, n. sp. 



Black, shining, form and aspect of placidus. Rostrum longer than half 

 the thorax, moderately arcuate, compressed, surface moderately punc- 

 tured, at base a fine channel terminating in a moderately deep fovea? be- 

 tween the eyes. Thorax longer than wide, anteriorly moderately con- 

 stricted, sides in front rather strongly arcuate, behind the middle fee- 

 bly arcuate and narrowed to base, surface moderately convex, without 

 vitta? but with a slight impression at middle, behind the anterior con- 

 striction (as in placidus), and a V-shaped impression behind, more 

 coarsely punctured, the remainder of the surface sparsely and finely 

 punctured becoming more dense toward the sides and coarse at the basal 

 angles. Scutellum feebly concave. Elytra oval, sides feebly arcuate 

 and slightly narrowed toward the tip, surface finely striate, stria? not 

 punctured but interrupted by large shallow fovea? moderately approxi- 

 mated ; intervals slightly unequal, the sutural, 2-4-6-3 bi-seriately finely 

 punctulate at base, gradually becoming uni-seriate at apex, narrower 

 intervals uni-seriately punctulate. Pygidium coarsely and deeply punc- 

 tured, apex and base more finely and the former more densely punctulate. 



