182 NORTH AMERICAN 



which are scarcely visible ; punctures large, round, deeply impressed ; evenly 

 distributed, distant by about one-half their own widths ; interspaces polished ; 

 ocular lines meeting at about one length in advance ; antennae much longer 

 than the width of head, pale testaceous, darker toward tip, slender, club 

 moderate; third joint one-half longer than the fourth, eighth more robust 

 than the seventh, joints of club slightly elongated ; maxillary palpi slender, 

 long, flavate, third joint slightly dusky toward tip. Prothorax arcuately, 

 evenly, and gradually increasing in width to the middle, where it is four- 

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

 rather more rapidly convergent posteriorly and feebly sinuate; anterior and 

 posterior margins equal in length and curvature, rather feebly arcuate ; 

 surface closely, finely, deeply, and evenly punctate ; interspaces convex 

 and polished. Elytra at base about equal in width to the head ; sides 

 rather feebly divergent posteriorly, slightly longer than the width at base, 

 rather strongly arcuate, more strongly so posteriorly ; together broadly, 

 roundly, and rather strongly emarginate behind ; suture nearly one-fourth 

 longer than the pronotum ; surface convex, slightly impressed on the suture 

 toward the base, closely, nearly evenly, rather finely, and very deeply 

 punctate ; interspaces narrower than the punctures, very convex, polished. 

 Abdominal segments cylindrical, decreasing uniformly and rather rapidly in 

 width, first distinctly narrower than the contiguous elytra ; border obsolete ; 

 surface very closely, coarsely, deeply, and conspicuously punctate ; each seg- 

 ment strongly constricted at base ; transverse carinae not cusped, finely un- 

 dulated. Legs rather long and slender, piceo-fuscous, femora much paler 

 beneath ; first three joints of the posterior tarsi uniformly decreasing in 

 length ; fourth joints strongly bilobed. 



Mule. — Sixth segment very narrowly and deeply incised, angle of incisure 

 very slightly rounded, nearly acute, depth more than twice its width : seventh 

 segment narrowly and feebly emarginate at tip, emargination rounded, teeth 

 small, acute, inclined inward. 



Female. — Sixth segment broadly and obtusely rounded behind. Elytra at 

 base usually slightly wider than the head ; form more robust ; abdomen wider. 



Length 3.0 mm. 



Grimsby, Ontario, 5. 



This species bears a great resemblance to punctatus (Er.), and also 

 to artus. It differs from the former in its more slender form and 

 finer punctuation, and especially in its much more slender prothorax; 

 from artus it differs in the form of the pronotum, which in that species 

 is very slender and notably narrowed anteriorly. 



27. A. artllS n. sp. — Form very slender. Pubescence sparse, very fine, 

 semi-erect, dark plumbeous, scarcely visible ; entire surface of the body 

 highly polished. Head rather small, robust, much less than twice as wide 

 as long; interocular surface nearly fiat, one-half wider than the eye ; sulca- 

 tions narrow, not conspicuous ; intermediate surface as wide as the lateral 

 portions, very feebly convex ; punctures large, round, deeply impressed, 

 nearly evenly distributed except in the sulcations, where they are slightly 



