THE CANADIAN ENTOMOLOGIST. 



from one half to two thirds distance from base ; the spaces between the 

 ribs excavated roundly, and crossed by many fine ridges ; the micropyle 

 in centre of a rosette of fine minute flat cells, outside of which are four 

 irregular rings of excavated cells, generally long and narrow, varying from 

 sub-crescent to five-sided ; color greenish-yellow. Duration of this stage 

 10 to ii days, in July. 



Young Larva. — Length .08 inch; cylindrical, even; color yellow- 

 green ; marked as in the allied species by flattened, tuberculous, brown 

 spots in longitudinal rows, three rows on either side above spiracles ; each 

 of which gives one or two long, tapering hairs ; below the spiracles 

 another row of similar smaller spots ; on dorsum of 2 an oval dark patch 

 with a row of hairs in front, turned forward, and a shorter row behind ; 

 head obovoid, bilobed, black, shining, with many long hairs. The larva 

 hibernates from the egg. 



After first moult, in spring: Length .1 inch; color greenish-brown, 

 mottled ; the spines as in the genus in number and position, stout at base, 

 tapering to top, with many divergent short bristles ; head obovoid, black. 

 Duration of this stage 9 days in April and May. 



After second moult : Length .18 inch ; color gray ; a black mid-dorsal 

 line ; the spines black ; the tubercles at base of dorsal spines black, of the 

 middie row yellow-brown, of the lower row same and more decidedly ; 

 head as before, black. To next moult 7 days, in May. 



After third moult : Length .25 inch ; color gray and black, either dark 

 gray or whitish, individuals differing ; a broad, ciear gray band fills all the 

 space between the two dorsal rows of spines, through which runs a black 

 line, sometimes macular, or partly wanting ; the spines as at last previous 

 stage, the yellow at bases darker ; head black over the front, yellowish 

 behind. To next moult 6 days. 



After fourth moult : Length .46 inch ; color over upper part black 

 with yellow white and gray bands and stripes ; the dorsal band yellow- 

 white, with more or less of a mid line of black ; between the dorsals and 

 middle row a gray stripe, and from each dorsal spine a similar stripe runs 

 to the base of the spine next in advance on middle row ; all the spaces 

 between the band and these stripes black ; the sides gray ; the lower row 

 of spines deep yellow at base and half way up, all others yellow at base 

 only, remainder greenish-gray ; head as before. To next moult 7 days. 



