28 THE CANADIAN ENTOMOLOGIST. 



mm.; width, -50-55 mm,; yellowish-white; slender; thoracic and abdom- 

 inal segments to seventh equal width (dorsal to ventral) and narrowing 

 from seventh to last ; hairs fewer and shorter than in first stage ; head 

 with brown, longitudinal line in front and short longitudinal groove 

 above; mouth-parts darker. Matured larva (fig. 3.): Length, 2.8-3 

 mm. ; width (lateral view) about .88 mm. at third thoracic segment and 

 seventh abdominal, and .80 mm. at second to third, and narrowing from 

 seventh to .30 mm. at last abdominal ; colour, yellowish-white to yellow ; 

 head darker, with dark brown mandibles and brown longitudinal line, 

 depression less than in intermediate stages ; body stouter, thoracic seg- 

 ments much larger and head much smaller in proportion to body than 

 in first and intermediate stages ; segments and head sparsely clothed with 

 short, fine hairs ; mouth-parts as shown in fig. 8. 



Piipa % (fig. 4.) : Length, 2.4-2.5 mm. ; width (lateral) about 

 .8 mm. ; colour, yellowish-white to yellow ; prothorax with dorsal 

 posterior margin elevated, forming a conical hump ; mesoscutellum 

 prominently elevated and slightly bent forward ; wing pads extended 

 to posterior ventral margin of the fourth abdominal segment, the tips 

 meeting or sometimes separated by a narrow space ; antennre prominent, 

 tip of clubs extending beyond the middle of the front coxce and to the 

 base of the front tibia ; hind tarsi- with tips extending to tips of wing pads. 

 The hairs, with which the front, the lateral and dorsal surface of the pro- 

 thorax and dorsal surface of the abdominal segments are sparsely clothed, 

 are fine and do not rise from tubercles. 



Pupa ^ : Length, 2 mm.; width (lateral) .7 mm.; easily distin- 

 guished from the female pupa by its smaller size and bent form ; the 

 abdomen is narrower and the tip bent down until it is even with the 

 ventral edges of the wing pads ; the hairs are fewer but stiffer and longer 

 than on the female pupa. 



Imago ? ' (fig. 5) : Length, 2.3-2.5 mm.; width (dorsal) .73-74 mm.; 

 colour varies from yellowish-brown to black ; easily distinguished from all 

 other known species of the genus by its size and the sculpture of the 

 elytral declivity and the regular rows of small teeth on the first, third, 

 fourth, and sometimes the fifth interspaces, as shown in fig. 7. There is 

 considerable variation in colour and in the number and rows of teeth. 



I. P'emale — BostricJms xylograplms. Say, 1826, 1. c. 

 Bostriclms saxeseui, Ratzburg, 1837, 1. c. 

 Tomicits dohrnii, Woll., 1854, Ins Mad., p. 290. 

 Xylebonis dryoi^raphus, Ferrari, 1867, Barkenk., p. 20, 



