126 



Anisandrus populi Sw. Dom. Ent. Br., Dept. Agric, Bull. 14: 22, 1917. 



Host trees. — Poplars. 



Distribution. — Ste. Anne de Bellevue; Chelsea, Que.; probably well 

 distributed through southern Quebec and southern Ontario. Abundant 

 locally in unthrifty and dying trees, with T. retusus Lee. (PI. 18, fig. 15.) 



The Genus Xyleborus Eichhoff. 



Eichhoff, Berl. Ent. Zeit., p. 37, 45, 46, 1864. 



Key to the Species, based on Females. 



A The scutellum indistinct, oblique, carinate, and depressed {Xyleborinus 

 Reitter). The apex of the elytra very broadly rounded, with a pro- 

 minent acute marginal granule on each side the apex, at the end of the 

 3rd interspace; the elytra strongly narrowed on the caudal half, rather 

 closely serrate on the 1st and 3rd interspaces, with about six well- 

 developed acute points on each, the 2nd interspace slightly impressed; 

 the declivity subopaque. saxesceni Ratz. Page 127. 



AA The scutellum distinct, horizontal, smooth, not depressed. The apex of 

 the elytra rather narrowly rounded, without a distinct marginal granule 

 at the end of the 3rd interspace; the sides parallel beyond the middle 

 of the elytra, only moderately narrowed behind, the declivital granules 

 sparser, usually three or four on the declivital face. 

 B Declivity of the elytra with the 1st interspace granulate or finely 

 tuberculate. 

 C Elytral declivity flattened. 



D Rather elongate; the pronotum decidedly longer than wide; the 



elytra evidently narrowed behind with the apical margin 



rather narrowly rounded; the flattened area of the declivital 



face narrower, hardly including the 4th interspace, the 



declivity usually strongly opaque. 



The Harris metatype of xylographus Say. Page 127. 



DD Moderately stout; the pronotum slightly longer than wide; the 



elytra only very faintly narrowed just before the declivity, 



the apical margin broadly rounded; the flattened area of the 



declivity wider, including the 4th interspace; the declivity 



semi-opaque. canadensis Sw.* Page 127. 



CC Elytral declivity evidently convex as seen from above, shining; 



strial punctures of the declivity very coarse and shallow; the 1st 



and 3rd interspaces with about four very small, widely separated 



granules; the pronotum roughly punctured behind; the elytral 



strise strongly impressed and the interspaces convex. 



pubescens Zimm. Page 128. 



BB Declivity of the elytra with the first interspace unarmed except at the 

 summit. 

 C Declivity with the 2nd interspace bearing two large subequal teeth, 

 the four at the angles of a square; the 3rd unarmed; the 4th 

 and outer interspaces with acute granulations; the declivity flat, 

 obliquely truncate, with the margin acute and serrate on the 

 sides below; size much larger, 4 mm.-4-5 mm. 



celsus Eichh. Page 128. 



and 



* propinquus Eichh. has the pronotum lightly punctured behind, the elytral striae faintly impressed 

 the declivity subopaque. Not known from Canada. 



