125 



CC Length, 2-35 mm. to 2-5 mm.; the pronotum slightly wider than 

 long as viewed from above; the punctures of the elytral striae 

 more widely spaced, the distance between the punctures usually 

 greater than their diameter, (PI. 18, fig. 14). 



minor Sw. Page 125. 



AA The body much smaller, depressed and curved into the arc of a circle ; very 



strongly convex; oval in outline from above; the wings functionless; 



the pronotum smooth behind; the declivity without teeth. Males 



(PI. 11, fig. 1). 



B The pronotum without asperities, at most with minute granules. 



C Usually distinctly larger, stouter; the interstrial punctures of the 

 elytra small; with fine punctures on the front of the head. 



obesus Lee. Page 125. 



CC Usually distinctly smaller and more slender; length, 1-6 mm.; the 

 interstrial punctures of the elytra nearly as coarse as those of 

 the striae; with coarse, sparse punctures on the front of the head. 



populi Sw. Page 126. 



BB The pronotum with the cephalic half asperate or distinctly coarsely 

 granulate. 



C The pronotum narrowed in front, rather closely asperate; the disc 

 of pronotum and elytra nearly glabrous, pyri Peck. Page 125. 



CC The pronotum subcircular, coarsely granulate in front; the disc of 

 pronotum and elytra hairy; very much smaller. 



minor Sw. Page 125. 



Anisandrus obesus Lee; Am. Ent. Soc. Trans., 2: 159, 1868 (Xylehorus); 

 serratus Sw., Can. Ent., 42: 162, 1911. 



Female. — Length, 3-3 mm. to 3-7 mm., stout, black when mature, 

 sparsely clothed with long slender, gray hairs ; allied to pyri but distinctly 

 stouter, with the acute ridge of the seventh declivital interspace sparsely, 

 strongly serrate. Male: length, 1-65 mm. to 1-75 mm; dark brown 

 when mature, smaller and more fragile than the male of dispar (PI. 18, 

 fig. 16). 



Host trees. — Birches, Oaks, Maples, Beech. 



Distribution. — Southern Ontario, southern Quebec, Eastern United 

 States. 



Anisandrus pyri Peck; Mass. Agric. Jour., 4: 205-7, 1817 (Scolytus). 



Length, female, 3 mm. to 3-25 mm.; male, 2 mm. to 2-2 mm. Doubt- 

 fully distinct from the European dispar Fabr. There appears to be no 

 satisfactory specific difference between our Canadian species and the short 

 series of both sexes of dispar from Europe in our collection (PI. 18, fig. 13). 



Host tree. — Apple. 



Distribution. — Nova Scotia, southern Ontario, Eastern United States. 



Anisandrus minor Sw. Can. Ent., 44: 164, 1910. 



The female, length, 2 • 25 mm. to 2 • 5 mm. ; the male, length, 1 mm. to 

 1-2 mm. An examination of the type of obesus Lee. confirms Hopkins' 

 statement that minor is a distinct species. 



Host trees. — Maples, Beech. 



Distribution. — Southern Ontario, southern Quebec, and Eastern United 

 States. In dying trees. 



