1878. | 623 [LeConte. 
and the preceding are undistinguishable, except by the char- 
acters given above; the io are however easily recognized. 
68. Pityophthorus hirticeps. Yellow brown, shining, cylindri- 
cal, less slender than the two preceding species, sparsely retose with fine, 
erect yellow hairs. Prothorax a little longer than wide, roughened con- 
centrically for one-third its length ; sides and posterior part strongly, rather 
densely punctured, with a narrow smooth median space. Elytra with ap- 
proximate rows of punctures, interspaces irregularly transversely rugose ; 
apical declivity retuse and crenate, deeply concave near the suture, which 
is elevated and also crenate. Length 1.6 mm.; .06 inch. 
3’. Head broadly concave and opaque, fringed with long yellow hair. 
2. Head slightly convex, strongly punctured. 
Marquette, Lake Superior. Related to the two preceding, 
agreeing with P. annectens in sexual characters, but with the 
crenations of the apical declivity of the elytra stronger than 
in P. consimilis, while the form is a little more robust than 
in either. 
69. Pityophthorus pusio. Cylindrical, shining, piceous, witha few 
erect yellow hairs behind the middle of the elytra. Prothorax not longer than 
wide, roughened in front almost to the middle, strongly and densely punc- 
tured at the sides and behind, with a large, smooth, well-defined dorsal space. 
Elytra with small punctures, arranged in tolerably regular rows, apical 
declivity broadly concave, slightly retuse each side, with about three very 
small teeth; suture elevated, also with three or four slight inequalities. 
Front tibize with two very faint small teeth. Length 1.6 mm.; .06 inch. 
Marquette, Lake Superior; one specimen. The head is re- 
tracted so that the front cannot be seen. This species is of 
the size and form of P. pulicarius, but the elytral sculpture 
and the apical declivity are quite different ; it is more nearly 
related to the Californian P. puncticollis, but differs by the 
more robust form, and by the sparse crenations of the apical 
declivity, which are wanting in that species. 
70. Pityophthorus opaculus. Cylindrical, slender, testaceous, 
head and disc of prothorax darker ; anterior half rather strongly asperate, 
sides and posterior half sub-rugosely punctulate, dorsal line smooth, narrow. 
Elytra finely alutaceous, nearly opaque, marked with scarcely perceptible 
distant striz of very fine punctures ; apical declivity neither retuse nor con- 
cave, suture elevated, limited by a distinct strix. Length 1.3 mm.; .05 inch. 
Marquette ; one specimen. This species must be placed 
after P. comatus in my table (Rhynch. 352). The head is pune- 
tured, and slightly convex, the legs and antennz are yellow. 
71. Pityophthorus plagiatus; Xyleborus plagiatus Lec., Tr. Am. 
Ent. Soc. 1868, 161 ; Rhynch 361. ) 
