COLEOPTERA. 25 



surface very feebly depressed on the suture at the base, coarsely, deeply, 

 extremely closely punctured and channeled. First four abdominal segments 

 equal in width and much narrower than the contiguous elytra; surface 

 coarsely, deeply, and moderately sparsely punctulate ; transverse carinae 

 tricuspid, middle cusps long and acicular, lateral short and inconspicuous. 

 Legs black above, tibiae and tarsi piceous beneath, slender, posterior femora 

 conspicuously and very densely clothed with long flavo-cinereous pubescence 

 along the posterior edge , first joint of posterior tarsi much more than twice 

 as long as the second, longer than the next three together, and three-fourths 

 longer than the fifth, joints very slender. 



Male. — First ventral segment having a short, narrow, longitudinal, and 

 prominent carina, terminating at its posterior edge ; second segment having 

 a similar carina, which does not attain the posterior edge ; third segment 

 emarginate in its middle twelfth at apex, emargination evenly rounded and 

 very feeble, surface having a carina similar to that of the first segment, which 

 nearly attains the emargination ; fourth segment emarginate in its middle 

 fifth at apex, emargination more acutely rounded at the bottom, about eight 

 times as wide as deep, contiguous surface feebly impressed for two-thirds the 

 length anteriorly, carina similar to that of the first segment, though slightly 

 longer, nearly attaining the emargination ; fifth segment very deeply ex- 

 cavated in its middle two-fifths, bottom of excavation not punctate, nearly 

 fiat, and declivous posteriorly, as long as wide, sides in the form of over- 

 hanging, very acute ridges ; anteriorly there is a carina similar to that of 

 the first segment, posteriorly the thin edge of the excavation is deeply emar- 

 ginate in its middle half, emargination one-half deeper than wide, transverse 

 at bottom, sides nearly parallel ; sixth segment sinuate at apex, sinus very 

 narrow and deep, acutely rounded at the bottom, 'much deeper than wide, 

 apices acutely rounded ; seventh segment dentate laterally behind, and 

 bearing on each side a long coarse seta. 



Female. — Sixth segment strongly narrowed posteriorly, bilobed at apex. 



Length 4.5 mm. 



Cambridge, Mass., 8; Michigan, 12 ; Texas, 1 ; Canada, G; Wash- 

 ington Territory, 7 ; Vancouver Island, 1. 



In the female the abdominal segments are much broader and have 

 the sides feebly convergent posteriorly. There are few species of the 

 order Coleoptera having sexual characters so distinct and complicated 

 as those seen in this little species ; a clear description of the fifth 

 segment of the male would he almost impossible. It is, perhaps, 

 cosmopolitan, being a very common species in Europe as well as in 

 America. 



11. S. vei'ticosllS n. sp. — Form robust. Pubescence very line, sparse, 



irregular, cinereous, and almost invisible. Head small, twice as wide as 

 long ; interocular surface nearly flat, more than twice as wide as the eye ; 

 longitudinal elevation slightly narrower than the lateral portions, very 

 strongly and evenly convex, prominent, sulcations parallel and distinct, 



