87 



Host trees. Maple, Beech, Hickory, and many deciduous trees; also 

 recorded from pine in West Virginia. 



Distribution. Eastern United States and Eastern Canada; apparently 

 very rare north of the St. Lawrence river. 



Pterocyclon mail Fitch; N.Y. Rep't. Nox. Ins. 3, No. 5, p. 8 (Tomicus), 1859; 

 longulum Eichh., Berl. Ent. Zeit., 278, 1868. 



Piceous; length, 2-2 mm. to 2-5 mm., slender; the female with the 

 declivity rather more strongly toothed, with long hairs from the distal 

 margin of the club, and the fore tibiae rather finely granulate, as usual. 



Host trees. Apple, Oak, Birch, and many deciduous trees; recorded 

 also from Pine. 



Distribution. Eastern United States, Ontario, and Quebec. 



The Genus Cryphalus Erichson. 

 Erichson, Wieg. Archiv., 1: 64, 1836. 



We have a very small number of species of this genus in our Canadian 

 fauna. C. balsameus Hopk. is exceedingly abundant in the east; C. approxi- 

 matus Hopk. and C. subconcentralis Hopk., or closely allied species, occur in 

 British Columbia; C. canadensis, described herewith by Professor Chamberlain, 

 was taken in the Selkirks at Rogers' Pass. In addition to these I have taken 

 two variations or possibly distinct species in Abies grandis at Saanichton, 

 Vancouver island. We have only a very few specimens of these western species 

 from British Columbia. Our material had been sent to Prof. W. J. Chamberlain, 

 who was monographing the genus. His studies have been interrupted, but in 

 the meantime his description of the new species canadensis is given here.* 



Key to the Species. 



A The interstrial hairs of the elytra long, stiff, erect, conspicuous, very much 



longer than the remaining scale-like pubescence. 



B The pronotal asperities confused and extending towards the base. 

 Wash. pubescens Hopk. 



BB The pronotal asperities in approximate, subconcentric rows. 



subconcentralis Hopk. Page 88. 



AA The interstrial hairs of the elytra very short and fine, inconspicuous, but 

 little longer than the remaining scale-like pubescence, and almost 

 invisible except on the sides and base. 



B The front feebly granulate, with a transverse, arcuate, smooth impres- 

 sion; the pronotum with the sides very strongly narrowed, the pro- 

 notal asperities rather small, the rugose area subtending a caudal 

 angle of about 60; the punctures very small and dense. 

 C The pronotum narrowly rounded in front; the fine interstrial hairs 

 of the elytra somewhat more evident. 



canadensis, n. sp. Page 88. 



CC The pronotum rather broadly rounded in front. Idaho. 



approximates Hopk. 



BB The front coarsely granulate, convex, with a median, shining, epistomal 

 carina; the pronotum with the sides rather strongly arcuate, the 

 pronotal asperities coarse, relatively numerous, the rugose area sub- 

 tending a caudal angle of about 90. balsameus Hopk. Page 89. 



Professor Chamberlain's descriptions of C. amabilis and C. grandis have appeared too late to be 

 inserted in these keys; Can. Ent., 49: 321-323, 1917. 



