86 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



the tibiae armed with a distinct tooth at apex, antennae not longer 

 than pronotum, last abdominal segment not fimbrate at apex, the 

 prosternum conspicuously pubescent, front of head densely clothed 

 with long white hairs behind the epistoma, and the genitalia with the 

 sides arcuately expanded and not transparent at apex. The females 

 can not be satisfactorily separated from those of the allied species. 



24. AGRILUS ATRICOKNIS, new species 



Figure 18 



Male. — Form resembling otiosus Say. and rather strongly shining; 

 antennae bluish black; head dark blue, with a feebly greenish tinge, 

 and becoming slightly aeneous on the occiput ; pronotum dark brown, 

 becoming slightly aeneous toward the sides; elytra uniformly brown- 

 ish black; beneath piceous, with a feeble aeneous reflection. 



Head with the front wide, vaguely convex, equal in width at top 

 and bottom, the lateral margins nearly parallel to each other, and 

 with a vague, longitudinal groove extending from occiput to middle 

 of front; surface densely granulose, coarsely, sparsely punctate, be- 

 coming transversely rugose behind the epistoma, and sparsely clothed 

 on lower half with long, white hairs; epistoma transverse between 

 the antennae, and broadly, arcuately emarginate in front ; antennae 

 extending to about middle of pronotum, serrate from the fourth 

 joint, and the outer joints about as wide as long; eyes large, broadly 

 oblong, and about equally rounded above and beneath. 



Protoum one-fourth wider than long, base and apex about equal 

 in width, and widest along apical half; sides nearly parallel from 

 apical angles to middle, then obliquely narrowed to the posterior 

 angles, which are nearly rectangular; when viewed from the side 

 the marginal carina is rather strongly sinuate, the submarginal carina 

 nearly straight, the two carinae rather widely separated anteriorly, 

 and connected to each other near the posterior angles; anterior mar- 

 gin strongly sinuate, with the median lobe strongly, broadly 

 rounded ; base strongly, transversely bisinuate, the median lobe feebly 

 produced, and subtruncate in front of scutellum; disk moderately 

 convex, with two round, shallow depressions arranged longitudinally 

 at the middle, a broad, deep, oblique depression along lateral mar- 

 gins, and with short, feebly elevated prehumeral carinae; surface 

 densely, finely granulose, feebly but not closely, transversely rugose, 

 and with numerous rather coarse punctures between the rugae. Scu- 

 tellum strongly, tranversely carinate, and the surface obsoletely 

 reticulate. 



Elytra slightly wider than pronotum at base, and about equal in 

 width at base and just behind the middle ; sides parallel for a short 

 distance behind base, broadlv, arcuatelv constricted in front of 



