86 



punctures on the sides of the pronotum behind, and the nearly obsolete 

 decli vital granules. Our type of description agrees with Kirby's type; 

 compared by R. N. Chrystal. Our series of 50 adults appear to be 

 distinct from bivittatum. 



Host trees. — Spruce, and probably Jack Pine. 



Distribution. — Western Ontario and northern Manitoba. The tunnels 

 and habits are similar to those of bivittatum. 



Trypodendron ponderosae Sw.; Dom. Ent. Br., Dept. Agric; Bull. 14: 22, 1917. 



" This species is very closely allied to rufitarsis Kirby, but is distin- 

 guished by its constantly darker colour, deep shining black, with an 

 indefinite area on the disc of the pronotum and elytra very dark reddish 

 brown; the interstrial punctures very small; the decli vital striae very 

 strongly impressed, with the second interspace deeply sulcate." 



Host trees. — Western Yellow Pine, Engelmann's Spruce, Douglas 

 Fir, and Mountain Balsam. 



Distribution!. — Southern coast and interior of British Columbia. 



The Genus Pterocyclon Eichhoff. 



Eichhoff, Berl. Ent. Zeit., 12: 276, 277, 1868. 



Monarthrum Kirsch. 



Kirsch, Berl. Ent. Zeit., 9: 213, 1866; (Inadequate). 



Key to the Species of Northern America. 



A With a prominent, well developed, submarginal epistomal process, narrow 

 and trifid in the female, broad in the male; length, 3-5 to 4-1 mm.; 

 declivity of male concave, of female plano-convex. California. 



scutellare Lee. 



AA Without a prominent, well developed epistomal process; smaller species, 



less than 3 • 5 mm. ; with little sexual difference on the declivity. 



B With the elytra rather densely hairy behind and on the declivity, the 



basal three-fourths or less or at least the central portion of the elytra 



pale yellow, the apex brown to nearly black. 



fasciatum Say. Page 86. 

 BB With the caudal part of the elytra at most with few and scattered 

 hairs, the elytra light to dark brown. 

 C With two widely separated denticles near the middle of the 'declivital 

 face of each side near the suture; declivity oblique. 



mali Fitch. Page 87. 



CC With the dorsal margin of the declivity on each side swollen and 



bearing two small denticles; with a single minute denticle on the 



middle of each declivital face; the declivity vertical. California. 



denteger Lee. 



Pterocyclon fasciatum Say; Jour. Acad. Sci. Phil., V, 255; ed. Lee, 2: 318 

 (Bosirichus), 1825; sirnile Eichh., Berl. Ent. Zeitschr., 277, 1868; gracile 

 Eichh., Rat. Tomic, 444, 1878, 9. 



Length, 2-4 mm. to 2-7 mm., reddish to dark brown with the basal 

 three-fourths of the elytra straw yellow, and densely hairy behind. The 

 female has the front minutely punctured and slightly concave at the 

 middle, the dechvity more evidently swollen above, and the usual 

 characters of antenna and fore tibia. 



