124 NORTH AMERICAN 



as the head, and slightly narrower than long ; sides thence almost equally 

 convergent anteriorly and posteriorly, slightly arcuate in the former, and 

 feebly sinuate in the latter direction ; anterior margin very slightly longer 

 and more arcuate than the posterior ; surface very evenly convex, rather 

 finely, distantly, and evenly punctate; punctures rounded and deeply im- 

 pressed ; interspaces feebly convex and very highly polished. Elytra at 

 base distinctly narrower than the head ; sides rather strongly divergent 

 posteriorly, much longer than the width at base, and feebly arcuate, much 

 more strongly so toward the apices, almost straight near the base ; together 

 broadly, roundly, and very feebly emarginate behind ; suture from one-fourth 

 to one-fifth as long again as the pronotum ; surface rather depressed, very 

 even ; finely, very distantly, and rather evenly punctate ; punctures im- 

 pressed ; interspaces very feebly convex and having an extremely high polish. 

 First two abdominal segments equal in width, and as wide as the contiguous 

 elytra, the remainder decreasing uniformly and very gradually in width ; 

 surface very broadly convex, highly polished, coarsely, evenly, and distantly 

 punctulate ; transverse carinae not cusped. Legs rather long and slender, 

 dark rufo-piceous above, paler beneath ; first joint of the posterior tarsi 

 three-fifths as long again as the second, slightly longer than the fifth, second 

 slightly longer than the third, fourth much shorter, fifth very narrow at the 

 base, becoming very thick at tip. 



Male. — Fifth ventral segment not appreciably modified ; sixth broadly and 

 transversely truncate at apex, truncation rounded at the sides, and giving a 

 mere suspicion of sinuosity in the middle. 



Female. — Unknown. 



Length 2.1 mm. 



Detroit, Michigan, 1. 



The sexual characters are extremely feeble ; the species is other- 

 wise well marked. 



102. S. |>;i si perculus n. sp. — Form moderately slender. Pubescence 

 long, close, rather coarse, semi-erect, and very pale flavo-cinereous, promi- 

 nent. Head moderate, rather more than twice as wide as long ; interocular 

 surface nearly flat, twice as wide as the eye ; punctures rather small, deep, 

 close, evenly distributed, and irregularly polygonal, somewhat continent 

 anteriorly ; interspaces narrow, very convex, and highly polished ; longitu- 

 dinal elevation somewhat narrower than the lateral portions, rather acutely 

 ridged ; ocular lines meeting at about two lengths in advance ; first two 

 joints of antennae piceous-brown, sub-equal : eyes rather short, vevy convex, 

 clothed with very short, erect setae ; maxillary palpi rather short, last joint 

 strongly clavate, pale piceo-testaceous throughout. Prothorax arcuately and 

 rather rapidly widening to a point nearly three-fourths the length posteriorly, 

 where it is three-fourths as wide as the head and distinctly narrower than 

 long ; sides thence moderately convergent and sinuate ; anterior margin much 

 shorter and more arcuate than the posterior ; surface nearly evenly convex, 

 with an extremely feeble tuberculiform swelling near each basal angle, 

 and a very feeble transverse impression just behind the anterior margin; 

 rather coarsely, closely, and evenly punctate ; interspaces narrow, convex, 



