18 NORTH AMERICAN 



hind mid-section ; surface deeply and closely punctured, interspaces narrow 

 and shining ; commencing at the middle and extending posteriorly a distance 

 equal to about one-fourth the length, there is a narrow and deep canalicula- 

 tion. Elytra at base about equal in width to the head, together deeply 

 emarginate anteriorly, each bisinuate posteriorly ; sides divergent poste- 

 riorly, evenly arcuate ; humeral angles somewhat rounded; surface coarsely 

 and closely punctate, and longitudinally channeled; just behind the middle 

 of each, there is a very small orange spot. Abdominal segments decreasing 

 very gradually in width posteriorly ; sides of each markedly sinuate ; surface 

 rather finely and closely punctate ; transverse carinae tricuspid posteriorly, 

 with the intervals sinuate ; middle cusps very narrow and cariniform. Legs 

 moderately long and slender ; femora and tibiae fusco-testaceous ; tarsi deep 

 fuscous, first joint of posterior nearly equal in length to the next three 

 together. Under surface of body piceons-black, generally finely punctulate. 



Male. — Third ventral segment feebly impressed throughout the middle 

 third, margin entire; fourth segment very feebly sinuate in its middle two- 

 fifths, surface distinctly impressed anteriorly for the same width, borders of 

 impression densely ciliate ; posterior edge of the fifth segment broadly emar- 

 ginate in its middle two -fifths, emargination evenly rounded, over four times 

 as wide as deep, surface impressed throughout in the form of a broad, rather 

 deep channel, with the borders densely ciliated ; sixth segment deeply and 

 acutely emarginate in its middle third at apex, depth of notch equal to its 

 width, angle rounded, surface of segment not impressed ; seventh segment 

 broadly emarginate at apex. 



Female. — Sixth segment convex; length equal to breadth at base, sides 

 evenly rounding except at the apex, which is feebly sinuate. 



Length o.b-4.4 mm. 



White Fish Point, Michigan, - r » ; western shore of Lake Superior, 2 ; 

 Marquette, Michigan, 4; District of Columbia, 1 ; Southern States, 

 1 ; Escanaba, Michigan, 1. 



Remarkable among the spotted species, for the well-marked sexual 

 characters of both male and female. The spots are scarcely visible 

 in some specimens. 



6. S. gem mens n. sp. — Form rather slender. Pubescence of head, 

 pronotum, and elytra scarcely visible, more dense on the head ; that of 

 dorsal surface of the abdomen a little longer, slightly fulvous, setiform, very 

 sparse. Head twice as wide as long: interocular surface moderately exca- 

 vated, about twice as wide as the eye, densely punctured ; longitudinal ridge 

 rather well developed ; ocular lines meeting at one length in advance ; 

 antennae about equal in length to width of head, rather slender, deep 

 brownish-testaceous, club not prominent ; third joint one-half as long again 

 as the fourth ; fourth and fifth equal ; joints of club equal and somewhat 

 elongated ; maxillary palpi slender, flavate throughout. Prothorax twice as 

 long as the head, widest slightly before the middle, where it is slightly 

 broader than the interocular surface ; sides from widest section feebly con- 

 vergent and very slightly sinuate posteriorly; surface deeply and closely 



