ll',() THE CANADIAN ENTOMOLOGIST. 



triple brown line. Subventral space, from the spiracles to the feet, 

 irregularly mottled and streaked with yellowish. Feet black. The 

 minute piliferous tubercles of rows i and 2 are stained yellow. Width of 

 head, 1.2 mm. 



Fourth stage. — Head round, full, pilose, blackish-brown, paler above 

 the mouth and slightly shiny; width, 1.8 mm. Body largely obscure, 

 purple-brown, this colour forming a triple dorsal line and covering the 

 whole lateral area to the feet. Dorsum grayish-white between the lines, 

 and this colour also obtains in a rather broad lateral line and minute 

 mottlings all over the brown area, which are distinct without a lens only 

 subventrally. Thoracic feet black, abdominal ones concolorous with the 

 body. The tubercles are very inconspicuous, but row 1 is marked by 

 little yellow dots through the whole length. The hairs are fine and short, 

 pale, those arising from the body very much shorter than those from the 

 tubercles. In another example joints 5 and 12 were seen to be slightly 

 enlarged dorsally and coloured purple-brown, while all the turbercles of 

 rows 1-5 were obscurely yellow. 



Fifth stage. — Head slightly flat in front, blackish-brown, pale-purplish 

 in the sutures; labrum sordid white ; width, 2.3-2.5 mm. Body purplish- 

 brown, marked as before, but the pale gray parts are slightly obscured by 

 minute brown mottlings and the yellow piliferous tubercles are small but 

 very distinct. Each bears its one hair and the rest of the body is 

 minutely pilose. There are traces of a black bisected cervical shield ; no 

 distinct anal plate. In another example, the whole surface of the body 

 was marbled with pale gray, greatly obscuring the lines, though the yellow 

 tubercles were still distinct. 



At maturity the body was sordid white, thickly mottled with pale 

 brown, forming a faint triple dorsal, single subdorsal and stigmatal lines ; 

 spiracles black ; tubercles orange. 



Food-pla?it. — Species of willow (Salix). The larvae live singly, each 

 tightly wedged in a little house formed of leaves and silk, from which 

 they come forth to feed. Larvae from Boston, Mass. 



