1878.] 625 [LeConte. 
antennal club is very different ; the sutures are long curves, 
concentric with the apical margin, and the first joint is gla- 
brous, shining and elliptical in form. 
To this genus should be referred the Alaskan Bostrichus 
concinnus Mannh. Bull. Mose. 1852, 358; Tomicus conc. Lec., 
Tr. Am. Ent. Soe. 1868, 164; Rhynch. 367. Only 22 have 
thus far been collected. 
75. Tomicus balsameus. Blackish piceous, or brown, cylindrical, 
shining, clothed with long erect yellow hairs. Prothorax longer than 
wide, asperate for about one-half the length, then strongly but not very 
densely punctured at the sides and behind ; median space smooth, narrow, 
badly defined. Elytra with striz composed of large rather distant punc- 
tures, interspaces with equally large but very distant punctures ; declivity 
concave, sparsely not deeply punctured, margin with several small teeth 
and two large ones ; the apical part of the margin is nota continuous ridge. 
Front tibie dilated, with fourdistinct teeth. Length 2.3 mm. ; .09 inch. 
3 Head flat, shining, hairy with very long yellow hairs ; the four larger 
teeth of the apical declivity less prominent. 
2 Head finely punctured ; carinate with an acute elevated line ; four 
larger teeth of apical declivity very prominent. 
Central New York, where it has seriously injured the 
forests of Abies balsamea. For an account of the ravages of 
this insect see the Report of the Botanist in the 28th An- 
nual Report of the New York State Museum of Natural 
History, 1874, p. 32-38. I am indebted to Mr. J. A. Lintner, 
of the State Museum, at Albany, for a series of speci- 
mens. Some care will be necessary to distinguish this in- 
sect from Xyleborus punctipennis, but apart from the difter- 
ences of theanntenal club, the prothorax of T. balsameus is less 
densely punctured, the strize are more distinctly formed, and 
the apical declivity is less punctured, with the teeth (2) 
-more prominent, and not distinctly separated from the ele- 
vation of the margin of the declivity. The front tibiz are 
more distinctly toothed. The sutures of the club are straight 
and transverse, so that it belongs to the division Orthotomicus 
Ferrari, and may be placed in the table (Rhynch. 363), after 
latidens, to which it has no resemblance. 
76. Micracis opaciollis. Slender, cylindrical, dirty testaceous. 
Prothorax darker, opaque, finely asperate in front, indistinctly punctulate, 
thinly sprinkled with very small ochreo is scales. Elytra shining, punc- 
PROC. AMER. PHILOS. soc. xvil. 101. 8z. PRINTED JUNE 13, 1878. 
