16 NORTH AMERICAN 



antennae slender, dark brownish-testaceous, slightly longer than the width 

 of head, club not well developed ; third joint one half as long again as the 

 fourth, fourth and fifth equal, eighth very small, nearly globular, joints of 

 club slightly elongated, tenth about as long as the eleventh ; maxillary 

 palpi vt'vy pale yellowish- testaceous. Prothorax equal in length to twice 

 the head, widest at the middle, where it is one-third narrower than the head ; 

 surface densely and deeply punctate; sides parallel and slightly arcuate 

 through the middle half, thence rather rapidly convergent and sinuate; 

 canaliculation very narrow, short, and deep, commencing very slightly he- 

 hind the middle. Elytra at base much narrower than the head, and but 

 slightly broader than the base of the prothorax ; together deeply emarginate 

 anteriorly, and each Insinuate at the apex : suture equal in length to the 

 pronotum ; sides considerably divergent posteriorly ; humeral angles rather 

 well developed ; surface densely and closely punctate ; a bilobed, reniform, 

 rlavat^ spot begins slightly before the middle of each, and extends posteriorly 

 for a distance equal to one-third the length, commencing at a distance from 

 the suture visibly less than one-half the width. Abdominal segments de- 

 creasing but very slightly in width, rather sparsely punctate; transverse 

 carinae as in renifer, with the lateral cusps rather less developed than in 

 that species. Legs long and slender, femora very pale yellowish-testaceous 

 shaded with fuscous at the outer third; tibiae very slender ; tarsi slender, 

 pale testaceous, first joint of posterior equal in length to the next three 

 together. Color of under surface piceous-black, finely and sparsely punctu- 

 late. 



Male. — Fifth ventral segment abruptly and deeply emarginate in its middle 

 two-fifths, emargination evenly rounded, four times as wide as deep, the 

 adjoining surface being impressed for a short distance, terminal teeth mode- 

 rately developed ; sixth segment incised as in renifer, though rather more 

 broadly ; seventh broadly and feebly emarginate at apex. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 3.(3-3.9 mm. 



Washington, D. C, 5 ; Penington Gap, Va., 2 ; Michigan, 1 ; 

 Southern States, 5. 



This species is very closely allied to renifer Lee; it is, however, 

 much smaller and more slender, and differs notably in the width of 

 the head and punctuation of the dorsal surface of the abdomen. The 

 sexual characters are nearly the same in both. In facies the two 

 species are so distinct that they can be i*eadily separated by the 

 unaided eye. 



4. S. renifer Lee. — Form rather slender. Pubescence of entire body 

 very sparse, scarcely visible, cinereous on the head, pronotum, and elytra, 

 more dense but still short and setit'orm on the abdomen, where it is slightly 

 fulvous. Head twice as wide as long ; interocular surface moderately ex- 

 cavated, densely and profoundly punctured ; longitudinal carina moderately 

 prominent; ocular lines meeting at two lengths in advance ; antennae slen- 

 der, dark brownish-testaceous, equal in length to the head and pronotum 



