24 THE CANADIAN ENTOMOLOGIST. 



bristles from all tubercles below v are bright rust-red. Tubercle i about 

 one-half the size of ii ; ii has a shining base. Tubercles i, ii and iii are 

 black, iv behind and almost touching the spiracle very slightly reddish, 

 v and vi distinctly reddish, vii and viii on venter black. Spiracles 

 yellowish-white. The thoracic feet are shiny black outside, lighter 

 inside, tipped with pale brown and bear black and light-brownish 

 bristles. The prolegs are brownish-red, and bear many rust-red bristles. 

 On segment 2 there are several long thin hairs, not barbed, which slope 

 forward and hang down in front of the head. On segments n, 12 and 13 

 are also some long hairs, which are faintly barbed. 



Two days after moulting the spiracles had changed to a bright orange. 

 Five days after moulting the dorsal stripe was less conspicuous, being 

 imite bright on and near middle of each segment, but faint (whitish) near 

 division of segments. Eleven days after moulting the dorsal stripe was 

 creamy white, expanded somewhat in the middle of each segment. 



Length of mature larva 55 mm., extended 60 mm.; width at widest 

 part, 8.5 mm. 



Two other specimens of the mature larva differed somewhat from the 

 one from which the above description was drawn. This difference was 

 chiefly in the colour of the tubercles. In one of the specimens, tubercles 

 iv, v and vi were partly whitish, vii and viii being black as above. In the 

 other specimen, tubercle iii on abdominal segments, dorsal tubercles on 

 segments 3 and 4 and tubercles vii and viii were all reddish. In this 

 latter specimen tubercle ii, which was black, changed to reddish on ail 

 segments but 11, 12 and 13. The dorsal stripe was distinct in both 

 of these specimens, in the one case the colour being a dirty whitish, and 

 in the other a beautiful orange-yellow, distinct on all segments. On 

 segment 2 in this latter specimen the bristles from the front half of the 

 dorsal tubercles were bright rust-red, the same as those from tubercles 

 below spiracles, as well as nearly all the bristles from lower half of tubercle 

 iv, and the median suture of head was white. 



Mr. R. J. Crew, of Toronto, who has bred A. virgo, tells me that 

 about half of all the larvae he reared had the dorsal stripe. Mr. Brainerd 

 has also found the dorsal stripe to be common, and states that "a larva of A. 

 virgo with red spiracles in one skin will often have them jet black in the next." 



On the morning of the 16th May one larva began to make its 

 cocoon, which was very slight, being simply some leaves drawn together 

 and fastened by a few threads of silk. By the morning of the 22nd May 

 the larva had changed to pupa. Another began to spin on the 22nd May, 



