170 JOHN L. LECONTE, M. D. 



but differs by the conspicuous muricated points near the apex of the 

 prothorax. 



3. H. sericeus Mannh. Bull. Mosc. 1852, ^^b.^Hylurgus ser. Mannh. ibid. 

 1843, 296; 1852, 35fi. 



Alaska and California. 



4. H. nebulosus Lee. Proc. Acad. Nat. Sci. Pliila. 1859, 285. 

 California and Oregon. 



5. H. fasciatus. — Elliptical, convex, brownish-black, slightly pubescent, 

 densely covered with black opake scales ; head concave, with a narrow polished 

 median line ; prothorax twice as wide as long, strongly narrowed in front, 

 broadly rounded on the sides, near the base and tip with bands of pale scales 

 and hairs, the hinder one broadly interrupted at the middle; elytra with a 

 band before the middle, consisting of a large sutural spot and some smaller 

 ones towards the sides, a narrow, nearly complete band behind the middle, 

 composed of pale ashy scales; tip with a few ashy scales; striae deep, punctured. 

 Long. 1'5 mm. 



One specimen, York county, Pennsylvania. The club of the an- 

 tennae is one-half longer than wide, regularly oval, less acute than 

 usual, and the basal part is less pubescent and more shining. 



6. H. opaculus. — Cylindrical,brownish-black, opake, thinly clothed with short 

 stiff yellow hairs; antennae and feet ferruginous; head convex, thickly punc- 

 tured ; prothorax nearly as long as wide, narrowed in front, sides subsinuate 

 near the tip; densely but not finely punctured, with a very narrow faint dorsal 

 carina; elytra with striae composed of deep subquadrate punctures, intervals 

 narrow, rough with transverse rugosities. Long. 2*5 mm. 



Two specimens, Pennsylvania. The club of the antennae is sub- 

 ovate, nearly twice as long as wide, and more shining towards the 



base. 



B. 



7. H. dentatus Say, Journ. Acad. Nat. Sci. Phil, v, 258. 



Middle and Northern States, and Oregon; under bark of Juniperus. 

 This species, as observed by Say, strongly resembles in its specific cha- 

 racters Phloeotribus frontalis, but is always larger, being usually over 

 2 mm. long. In one sex the prothorax is much more rounded on the 

 sides and more suddenly narrowed near the tip than in the other. 



8. H. serratus Lee. 



One specimen. New York. 



9. H. crlstatus Lee. 

 California, Mr. Ulke. 



This and the preceding species closely resemble H. dentafus and differ 

 chiefly by the larger size and by the greater elevation and stronger ser- 

 ration of the third interval on the posterior declivity of the elytra; //. 

 serratus also has the sutural space strongly elevated and toothed, while 

 in H. cristatus, although serrate, it is much less elevated. 



