60 NORTH AMERICAN 



polished, very sparsely and finely punctulate ; transverse carinae tricuspid, 

 middle cusps fine and acicular, lateral nearly as long, dilated at apex, and 

 inclined inward, intervals moderately sinuate. Under surface dark piceous. 

 Legs rather slender, piceous ; first joint of the posterior tarsi twice as long 

 as the second, second notably longer than the third. 



Male. — Posterior edge of the fifth ventral segment feebly emarginate in its 

 middle third, emargination evenly rounded, ten times as wide as deep, con- 

 tiguous surface somewhat deeply and conically impressed, impression disap- 

 pearing anteriorly at one-half the length of the segment, having the borders 

 sharply defined and clothed with exceedingly long setae ; sixth segment 

 sinuate at apex, sinus acutely rounded at bottom, twice as wide as deep ; 

 seventh broadly and deeply emarginate at apex, provided with two long stiff 

 setae. 



Female. — Sixth segment evenly rounded behind without any perceptible 

 irregularity. 



Length 3.8-4.0 mm. 



Cambridge, Massachusetts, 1 ; Grimsby, Ontario, 3 ; Illinois, 1 ; 

 Nebraska, 1. 



Resembles intrusus somewhat ; it may be distinguished at once 

 from that species by its deeper, closer, and much more channeled 

 elytral sculpture, as well as by very decided differences in the sexual 

 characters. It appears to be much less abundant than intrusus, and 

 is very slightly more elongated in form. 



41. S. SCabiosiIS n. sp. — Form nearly as in femoratus. Pubescence very 

 short and sparse, sub-recumbent, fine, pale flavo-cinereous on the abdomen, 

 dark plumbeous on the remainder of the upper surface. Head robust, twice 

 as wide as long ; interocular surface scarcely twice as wide as the eye, dis- 

 tinctly depressed ; longitudinal elevation slightly narrower than the lateral 

 portions, rather strongly and evenly convex ; sulcations distinct ; punctures 

 small, round, isolated, moderately impressed, close; ocular lines meeting at 

 slightly less than one length in advance; antennae distinctly longer than 

 the width of head, slender, basal joint black, remainder dark piceous-brown, 

 club slender, much elongated ; third joint slightly bent, more than one-half 

 longer than the fourth, fourth and fifth equal, sixth and seventh sub-equal 

 in length, the latter much the more robust, eighth one-fourth longer than 

 wide, as robust as the seventh, ovoidal, joints of club increasing very rapidly 

 in length, last nearly twice as long as wide ; maxillary palpi long and slender, 

 piceous-brown throughout. Prothorax arcuately, evenly, and rather rapidly 

 increasing in width to a point distinctly behind the middle, where it is 

 five-sixths as wide as the head, and slightly narrower than long; sides 

 thence rapidly convergent posteriorly and distinctly sinuate ; anterior margin 

 slightly shorter and very slightly more arcuate than the posterior ; surface 

 strongly and distinctly tuberculate near the basal angles, transversely and 

 feebly impressed just behind the apex ; feebly, minutely, closely, and con- 

 fusedly punctate, transversely channeled in front of the middle ; canalicula- 

 tion terminating at equal distances from the base and apex, fusiform, rather 



