THE CANADIAN ENTOMOLOGIST. 71 



of the dorsal spines are pale buff on outer side, but black on dorsal side ; 

 the first laterals have black tubercles, and second laterals buff ; the inter- 

 mediate tubercles on anterior segments are yellow ; the dorsal spines on 2 

 are somewhat turned forward, but are no longer than others of same rows ; 

 head as before, except that on each vertex now appears a small conical 

 black process. To third moult, in fall, 6 days ; in spring, 7 to 1 2 days. 



AFTER THIRD MOULT— Length .3 inch; color velvety-black 

 with a brown tint ; the spines much longer and heavier than before ; the 

 outer side of tubercles of the dorsal rows is now dull yellow ; the spines 

 of first lateral row have very little yellow at base, and those of lower row 

 are yellow at base and a little way up ; head sub-cordate, much flattened 

 frontally, and on the summit of each vertex is a small sharp process as 

 before ; many small tuberculations over the face, each of which sends out 

 a black hair ; color of front head shining black, but the back is yellow. 

 To next moult, in spring, 11 to 14 days. 



AFTER FOURTH MOULT— Length .5 inch ; color as at previous 

 stage ; spines black, both dorsals and first laterals very slightly colored 

 reddish-yellow at base, scarcely visible except when viewed obliquely ; the 

 lower laterals and also the intermediate spines on anterior segments are 

 all orange at base and about half way up ; head as before, much flattened ; 

 color black, orange at back. In some examples the bases of lower spines 

 and the back of the head were reddish-yellow in the early part of this 

 stage, but became orange later. To next and last moult 15 days. 



AFTER FIFTH MOULT— Length .8 inch ; color velvety black ; 

 the dorsal spines are drab at base, except those on 2 and 3, which are 

 brownish-yellow ; all the spines of the two other rows are of same yellow 

 at base, but the tubercles orange ; the back of head a yellow-orange. At 

 about 20 days after the moult the larva reached maturity. 



MATURE LARVA — Length 1.4 inch at rest, greatest breadth across 

 middle of segment .3 inch; length in motion r.8 inch ; cylindrical, of 

 even thickness from 5 to n, the segments rounded; color velvety-black ; 

 the spines long, slender, tapering, of about equal length (the dorsals on 

 middle segments measure .15 inch to tubercle, .16 to skin), the long spines 

 on 2 are directed forward, but are not longer than others ; all the spines 

 are beset with many short black bristles ; those of the dorsal rows are 



