42 NORTH AMERICAN 



pale testaceous, second and third darker, testaceous. Prothorax widest 

 before the middle, where it is three-fourths as wide as the head, and one- 

 sixth narrower than long ; sides thence moderately convergent posteriorly 

 and very slightly sinuate ; anterior and posterior margins equal in length, 

 the former more arcuate ; surface with two very faint tuberculations on 

 each side, equi-distant from each other and from the anterior and posterior 

 margins ; canaliculation rather obscure, commencing at the middle and ex- 

 tending almost to the posterior margin ; slightly unevenly, coarsely, and 

 variolately punctured, interspaces unequal in width, very slightly convex, 

 polished. Elytra at base somewhat narrower than the head ; sides notably 

 divergent posteriorly, evenly and feebly arcuate, slightly longer than the 

 width at base; together broadly and very feebly emarginate posteriorly; 

 suture about equal in length to the pronotum ; surface rather coarsely and 

 unevenly punctured, punctures rather deeply impressed, closer and more 

 coalescent externally, interspaces near the suture about one-half as wide as 

 the punctures, shining, minutely reticulated. First three abdominal seg- 

 ments equal in width to the contiguous elytra ; border strong ; surface shin- 

 ing, rather coarsely punctulate anteriorly, more closely and finely so poste- 

 riorly ; transverse carinae tricuspid, cusps all very rudimentary, intervals 

 nearly straight. Legs rufo-piceous, moderate ; first joint of posterior tarsi 

 one-half as long again as the second, second notably longer than the third, 

 third and fourth equal in length. Under surface of abdomen dark pieeous, 

 finely and closely punctulate. 



Male. — Posterior edge of fifth ventral segment rather feebly emarginate in 

 the middle, emargination indefinitely terminated laterally, contiguous sur- 

 face very feebly and longitudinally impressed in its middle third, borders of 

 impression furnished with long, recumbent, pieeous setae ; sixth segment 

 broadly sinuate at apex, sinus evenly and somewhat acutely rounded at 

 bottom, and about three times as wide as deep, surface of segment not im- 

 pressed ; seventh segment broadly and very feebly emarginate at apex, emar- 

 gination almost transverse, terminating laterally in two strong, posteriorly 

 projecting teeth. 



Female. — Sixth segment broadly and very evenly rounded behind. 



Length 3.0 mm. 



Middle States, 1 ; Massachusetts, 1 ; Grimsby, Ontario, 3. 

 Very readily distinguished by the fourth joint of the antennae, 

 which is, rather anomalously, shorter than the fifth. 



24. S. Pettiti n. sp. — Form slender. Pubescence close, rather coarse, 

 short, sub-recumbent, evenly distributed, cinereous, with a slight fulvous 

 tinge on the abdomen. Head robust, not twice as wide as long ; interocular 

 surface very feebly depressed, twice as wide as the eye ; longitudinal eleva- 

 tion narrower than the lateral portions, rather feebly and evenly convex, 

 distinct ; punctures fine, rounded, not coalescent, evenly distributed, and 

 very close ; ocular lines meeting at slightly more than one length in advance ; 

 antennae very slightly longer than the width of head, rather robust, piceous- 

 brown, basal joint black, club very moderate ; third joint one-third longer 

 than the fourth, joints four, five, and six uniformly and rather rapidly de- 



