176 NORTH AMERICAN 



generally distant by less than one-half their widths ; interspaces very feebly 

 convex ; ocular lines meeting at two lengths in advance ; antennae rather 

 slender, as long as the width of head, basal joint black, remainder dark 

 brownish-testaceous, club distinctly darker ; third joint slightly more than 

 one-half longer than the fourth, seventh much longer and slightly less 

 robust than the eighth, joints of club robust; maxillary palpi long, joints 

 one and two slender, the former flavate, the latter slightly darker, testaceous, 

 third joint slender at base, becoming strongly enlarged toward the tip, dark 

 castaneous toward the apex. Prothorax widest distinctly behind the middle, 

 where it is slightly narrower than long ; sides thence very feebly convergent 

 and somewhat unevenly arcuate anteriorly, more rapidly convergent and 

 feebly sinuate posteriorly ; anterior margin longer than the posterior, equally 

 and very feebly arcuate ; surface nearly evenly convex throughout, rather 

 coarsely, very closely, deeply, and somewhat unevenly punctate; punctures 

 round, generally distant by one-half their widths. Elytra at base about 

 equal in width to the head ; sides rather feebly divergent posteriorly, dis- 

 tinctly longer than the width at base, nearly straight to within a very short 

 distance of the apices, where they are feebly arcuate ; together broadly, 

 somewhat angularly and feebly emarginate behind ; surface rather depressed. 

 broadly and feebly impressed on the suture toward the base, coarsely and 

 somewhat loosely punctate ; punctures round, deeply impressed, nearly 

 evenly distributed, distant by nearly their own widths; interspaces rather 

 convex, polished, deep black, scarcely visibly reticulated. Abdominal seg- 

 ments decreasing uniformly and very gradually in width, first as wide as the 

 contiguous elytra, nearly cylindrical after the first ; border nearly obsolete 

 except on the first segment ; surface deeply, closely, rather coarsely, and 

 evenly punctate ; punctures very deeply impressed, as large as those of the 

 pronotum ; transverse carinae indefinitely cusped in the middle. Legs short 

 and slender, black, tarsi pale brownish ; first joint of the posterior not as 

 long as the next two together, distinctly shorter than the last ; fourth joints 

 very strongly bilobed, third very deeply emarginate at tip. 



Male. — U 11 know n . 



Female. — Sixth ventral segment very long,.narrowly and obtusely rounded 

 at the immediate apex, sides thence widely divergent and feebly sinuate to 

 the lateral edges of the segment ; seventh segment narrowly and deeply 

 bilobed at tip. 



Length 5.0 mm. 



Grimsby, Ontario, 4; Northern Illinois, 1. 



The tarsi of the specimen from Illinois are much more densely and 

 coarsely hirsute, and the seventh segment is more deeply bilobed at 

 tip than in those from Ontario. 



The above-described species resembles pollens from Washington 

 Territory in general appearance and size, but in scarcely any other 

 feature; the punctuation is very much coarser and more sparsely dis- 

 tributed on the elytra, and is much more dense, deep, and prominent 

 on the abdomen. 



