54 NORTH AMERICAN 



the head, and very slightly narrower than long ; sides thence moderately 

 convergent anteriorly and posteriorly, and nearly straight ; anterior and 

 posterior margins sub-equal in length and curvature; surface very faintly 

 tuberculate on the sides at the base, finely and distantly punctured, punc- 

 tures somewhat irregular in outline, and slightly narrower than the inter- 

 spi :es in the middle, the latter flat and minutely reticulated ; canaliculation 

 broadly oval and deeply impressed, conspicuous, beginning slightly before the 

 middle, one-half as long as the pronotum. Elytra at base distinctly narrower 

 than the head; sides rather strongly divergent posteriorly, very slightly 

 longer than the width at base, almost straight; together broadly, roundly, 

 ami distinctly emarginate behind ; suture about equal in length to the pro- 

 notum ; surface depressed, very feebly impressed along the suture toward 

 the base, rather coarsely, closely, and evenly punctate; punctures feebly 

 impressed, more than twice as wide as the interspaces, which are flattened 

 and somewhat wider near the inner basal angles. Abdominal segments 

 decreasing arcuately in width, and with extreme slowness, first somewhat 

 wider than the contiguous elytra ; surface broadly convex, very irregularly 

 punctulate, punctures very coarse at the bases, much finer and more sparse 

 at the apices ; transverse carinae tricuspid, middle cusps long, aciculate, 

 and prominent, lateral very short, rounded at tip, broad, and rudimentary. 

 Legs short and slender, fuscous above, femora rufous beneath; first joint 

 of the posterior tarsi one-third as long again as the second, and somewhat 

 shorter than the last, joints two to four uniformly and rather rapidly decreas- 

 ing in length. 



Male. — Unknown. 



Female. — Sixth ventral segment evenly rounded behind, broad. 



Length 2.1 mm. 



Cambridge, Massachusetts, 1. 



The pro-thorax somewhat resembles that of mendax in the nature 

 of the sides. 



o~j. S. SOtotilis n. sp. — Form slender. Pubescence rather short and 

 sparse, fine, sub-recumbent, setiform, cinereous. Head rather large, twice 

 as wide as long; interocular surface Hat, twice as wide as the eye, equally 

 trilobed by the faint sulcations ; intermediate surface feebly and evenly con- 

 vex ; punctuation fine, even, and rather sparse ; ocular lines meeting at one 

 length in advance ; antennae scarcely longer than the width of head, rather 

 robust, club moderate, basal joint black, remainder dark pioeous-brown, 

 growing slightly paler toward tip ; third, fourth, and fifth joints uniformly 

 decreasing in length, sixth longer and much narrower than the seventh, 

 eighth wider than the seventh, globular, joints of club increasing slightly in 

 length; maxillary palpi moderate, first and second joints dark testaceous, 

 first slightly the paler, third joint piceous-black, and densely setigerous. 

 Prothorax widest slightly in advance of the middle, where it is three-fourths 

 as wide as the head and distinctly narrower than long ; sides thence moder- 

 ately convergent posteriorly and feebly sinuate ; anterior margin v^ry slightly 

 shorter and much more arcuate than the posterior ; surface nearly evenly 

 convex, rather coarsely, moderately closely, and very evenly punctate, inter- 



