COLEOPTEKA. 121 



moderate, fuscous; first joint of the posterior tarsi three-fourths as long again 

 as the second, second notably longer than the third. 



Male. — U n k n o w n . 



Female. — Posterior edge of the sixth ventral segment evenly rounded, but 

 slightly produced in the middle. 



Length 2.5 mm. 



Nebraska, 1. 



98. S. parallelllS n. sp. (Schwarz MS.). — Form moderately slender. 

 Pubescence exceedingly sparse and short, almost invisible, except on the 

 head and abdomen, cinereous. Head moderate, scarcely twice as wide as 

 long ; interocular surface two and one-half times as wide as the eye ; densely, 

 rather finely, and evenly punctate; equally trilobed by the distinct, though 

 rounded sulcations ; ocular lines meeting at about one length in advance ; 

 antennae slightly longer than the width of head, dark piceous-black, club 

 moderate; third joint one-third as long again as the fourth, fourth and fifth 

 equal, eighth globular, joints of club gradually increasing in thickness and 

 length ; maxillary palpi dark piceous-brown, very slightly paler toward the 

 base. Prothorax widest just before the middle, where it is nearly five-sixths 

 as wide as the head ; sides thence convergent posteriorly and nearly straight ; 

 anterior and posterior margins equal in length, the former much the more 

 arcuate ; surface rather evenly convex, closely, somewhat irregularly, and 

 variolately punctate : interspaces seldom wider than the punctures, shining ; 

 a shallow medial depression extends longitudinally along the middle half, 

 widest at the middle. Elytra at base as wide as the head, sides slightly diver- 

 gent posteriorly and nearly straight ; broadly and rather strongly einarginate 

 behind, and almost equally so at the base ; suture scarcely perceptibly longer 

 than the pronotum ; surface coarsely, somewhat closely and unevenly punc- 

 tate ; punctures slightly variolate ; interspaces shining. First three abdo- 

 minal segments nearly equal in width, and as wide as the elytra ; border 

 moderate; surface polished, punctulate, more finely and closely so poste- 

 riorly; transverse carinae unicuspid, cusp very slender and aciculate. Legs 

 moderate, dark castaneous ; first joint of the posterior tarsi two-thirds as long 

 again as the second, second distinctly longer than the third. Under surface 

 of the abdomen finely and rather closely punctulate. 



Male. — Posterior edge of the fifth ventral segment sinuate, sinus feeble, 

 and one-third as wide as the segment, surface feebly impressed through 

 the same width anteriorly, impression rather densely pilose ; sixth segment 

 sinuate at apex, sinus narrow, about twice as wide as deep, surface convex. 



I-', mule. — Sixth segment broadly and very evenly rounded behind. 



Length 2.7-2.8 mm. 



Cambridge, Massachusetts, 7. 



99. S. noctivagus n. sp. — Form moderately slender. Pubescence as 

 in montanus, but more dense. Head robust, scarcely twice as wide .as long; 

 interocular surface flat, twice as wide as the eye; coarsely and variolately 

 punctate ; interspaces acute at the sides, equal in width to the punctures 



