118 NORTH AMERICAN 



six uniformly and rapidly decreasing in length, six and seven sub-equal in 

 length, the latter one-half as thick again, eighth as broad as the seventh, 

 sub-triangular, joints of club increasing in length, last two of equal thick- 

 ness | maxillary palpi dark piceous-brown, first joint and base of the second 

 much paler, piceo-testaceous. Prothorax arcuately, evenly, and moderately 

 rapidly increasing in width to a point just perceptibly in advance of the 

 middle, where it is four-fifths as wide as the head and slightly narrower than 

 long ; sides thence moderately convergent posteriorly and feebly sinuate ; 

 anterior and posterior margins equal in length, the former very slightly the 

 more arcuate ; surface feebly and minutely tuberculate near the basal angles, 

 transversely and very feebly impressed just behind the vertex ; punctures 

 small, rounded, and irregularly distributed, more crowded toward the base 

 and apex. Elytra at base as wide as the head ; sides very moderately diver- 

 gent posteriorly, much longer than the width at base and rather strongly 

 arcuate, more particularly so posteriorly ; together broadly, roundly, and 

 strongly emarginate behind ; suture one-third as long again as the pronotum ; 

 surface convex, narrowly impressed along the suture, more broadly and 

 strongly so toward the base ; punctures round, feebly impressed, and evenly 

 distributed, except in the basal regions, where they are closely crowded ; 

 interspaces generally as wide as the punctures, distinctly reticulated, feebly 

 convex, shining. First two abdominal segments equal in width, very slightly 

 narrower than the contiguous elytra ; surface coarsely, feebly, and somewhat 

 distantly punctulate at the base, becoming much more finely so toward the 

 tip : transverse carinae 4-cuspid, cusps nearly equal in length, somewhat ob- 

 scurely defined, though rather long. Legs short and slender, dark piceous- 

 brown ; first joint of the posterior tarsi three-fourths as long again as the 

 second, equal in length to the last, second somewhat longer than the third, 

 fourth very oblique, fifth very slender at the base. 



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

 fifth, emargination evenly rounded, and nearly ten times as wide as deep, 

 contiguous surface cylindrically and rather feebly impressed throughout 

 anteriorly ; sixth broadly and transversely truncate at the apex. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 2.5-2.7 mm. 



White Fish Point, Lake Superior, 2. 



T had separated the male of this species under another name, but 

 afterwards concluded to unite the two specimens, as there might 

 remain a doubt as to their distinctness, due to the difference of sex. 

 The male differs from the female in the much coarser and more even 

 punctuation of the elytra and pronotum, in the pubescence, which is 

 very much longer and denser, and in the structure of the antennae, 

 the male having the fourth and fifth joints equal in length. The 

 description is drawn from the female. 



95. S. minor n. sp. — Form slender. Pubescence fine, moderately abun- 

 dant, rather short and recumbent, cinereous in color. Head moderate, twice 

 as wide as long; interocular surface very slightly convex, more than twice 



