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Pityophthorus pulicarius Zimm.; Am. Ent. Soc. Trans., 2: 144, 1868 {Cryp- 

 turgus) . 



Length, 1-5 mm. to 1-8 mm.; a very distinct species by the characters 

 given in the key. Our northern specimens are usually similar to numbers 

 2, 3, and 6 in Leconte's series, with the pronotum more coarsely punctured 

 behind than in Zimmerman's type. The female has the front broadly 

 flattened, very closely, finely punctured, clothed with moderately long 

 hairs in a rather loose frontal brush; the male front is more strongly convex, 

 shining, glabrous, carinate behind, the epistomal region somewhat flattened, 

 rather finely, not very closely punctured. 



P. pulicarius Zimm. approaches Conophthorus in habitus; but the 

 antennal club is strongly septate ; the pronotum is distinctly though not 

 strongly asperate on the front margin, with the sides asperate on the frontal 

 half, as in Conophthorus, but simply punctured behind the middle, and the 

 transverse impression across the disc to be discerned, although very faint. 

 This species and ramiperda are each intermediate in certain characters 

 between typical Pityophthorus and Conophthorus. 



Host trees. — Red Pine in Quebec, and probably other Pines. 



Distribution. — Aylmer and Isle Perrot, Que., and probably also in 

 Ontario; widely distributed in the Eastern States. 



Pityophthorus rhois Sw.; Dom. Ent. Br., Dept. Agric, Bull. 14: 26, 1917. 



Length, 1-6 mm., width, -6 mm.; elytral striae moderately impressed, 

 coarsely punctured; the declivity steep, deeply sulcate, with striae 2 

 impressed and strongly punctured. 



Host tree. — Sumach, bark of dying and dead twigs and branches. 



Distribution. — Eastern Canada and Eastern United States. A common 

 species, heretofore usually confused with Leconte's consimilis. 



Pityophthorus puberulus Lee; Am. Ent. Soc. Trans., 2: 157, 1868. 



A very small species, length, 1-3 mm., thinly clothed with short, erect, 

 grey hairs. 



Host trees. — Pines and Balsam Fir. 



Distribution. — Eastern Canada and Eastern United States. Abundant 

 in dying twigs but commonly found killing twigs on Hving trees after the 

 manner of ramiperda. 



Pityophthorus opaculus Lee; Am. Phil. Soc. Proc, 17: 623, 1878. 



Length, 1-4 mm., allied to puberulus Lee, but rather more slender, 

 with the elytral punctures very much finer, finely granulate and in evident 

 rows, with the pronotum more broadly rounded in front. 



Host trees. — White Spruce, Larch, White Pine, Balsam Fir. 



Distribution. — Eastern United States, and Eastern Canada west into 

 northern Alberta. 



Pityophthorus tuberculatus Eichh.; Ratio. Tomic, 498, 1878. 



Length, 1-7 mm. to 2-3 mm. It has the frontal characters of the 

 nitidulus group, with small elytral punctures and widely sulcate and coarsely 

 granulate declivity; the declivity is less broadly rounded behind than usual, 

 with the suture more strongly developed, so that the declivital characters 

 are intermediate between nitidulus and pullus. 



Pityophthorus pseudotsugae, n. sp. 



Closely alHed to tuberculatus Eichh.; of the same size, shape, and 

 secondary sexual characters; but differing in having the serrations on the 

 front margin of the pronotum numerous and only very shghtly larger at 

 the middle line, the strial punctures usually regular, and the declivity with 

 36198—71 



