399 



Horn.] 0£i£i [June 20, 



S. lugens, Er. Jahrb., 1884, p. 181 ; Lee. Bost. Journ. V., p. 21, pi. 5, 

 fig. 4; Mars. Mon., 185.3, p. 395, pi. 16, fig. 34; califomicus, Mann. Bull, 

 Mosc., 1843, ii, p. 259 ; eonsimilis, Walker, Nat. in Vancouver, 18G6. 

 p. 319. 



Black moderately shining. Head rather densely punctured in front. 

 Occiput sm >other, frontal stria entire, but feeble at middle. Thorax 

 with very feeble impression near the front angles, disc smooth, at sides 

 with punctured space broader in front and base, continuing to the mar- 

 gin except near the hind angles, and narrowly along the basal margin. 

 Elytra with moderately well defined, smooth scutellar space, and a sub- 

 humeral space also smoother, remainder of surface densely punctured, 

 punctures becoming aciculate toward the apex ; external subhumeral 

 stria distinct, oblique humeral long, extending beyond its junction with 

 the internal subhumeral, which is longer than the first dorsal ; first and 

 second dorsals subequal extending two-thirds the length of the elytra, 

 third and fourth equal and slightly shorter than the preceding two, 

 fourth dorsal rarely arched at base, and then the arch formed of punc- 

 tures, sutural stria short, scarcely extending beyond the punctured space. 

 Propygidium and pygidium rather densely and coarsely punctured. 

 Prosternum in front moderately convex, strias anteriorly divergent and 

 slightly ascending. Anterior tibiae finely denticulate, middle and hind 

 tibiae biseriately spinulose. Length .1C-.24 inch ; 4-6 mm. 



Si mie of the smaller specimens of this species resemble distinguendus 

 very closely. 



A very abundant species occurring along the entire plains at the eastern 

 base of the Rocky Mountains, and westward along almost the entire 

 Pacific region. 



S. imperfectus, Lee. Bost. Journ. V., p. 70, pi. 5, fig. 3. 



Black shining. Head sparsely punctured, frontal stria entire. Thorax 

 smooth at middle, and near the sides with a coarsely punctured space 

 distant from the margin and with the punctures more sparse posteriorly, 

 basal region with a few coarse punctures. Elytra at apex sparsely punc- 

 tured, punctures extending in the first iuterstria, which is also slightly 

 wrinkled near the base ; external subhumeral distinct ; oblique humeral 

 long, bifid at tip, the outer branch joining the internal subhumeral which 

 is slightly longer than the first dorsal ; dorsals 1-2-4 subequal, extending 

 slightly beyond the middle, third dorsal much shorter than the others, 

 fourth dorsal slightly arched at base, sutural very short, represented by 

 a few closely approximated punctures near the middle of the elytra. 

 Propygidium and pygidium moderately densely and coarsely punctured, 

 the latter slightly reflexed at the sides. Prosternum moderately convex, 

 stria? in front divergent and slightly ascending. Anterior tibia? finely 

 denticulate, middle and hind tibia; biseriately and rather coarsely spinu- 

 lose. Length .18 inch ; 4.5 mm. 



This species, from the figure and description, appears to be closely 

 allied to concinnus, Mann., from Siberia, but it has a longer third stria. 



