THE CANADIAN ENTOMOLOGIST. 351 



The tubercles were numbered as follows : Eight on each of first five 

 segments, six each on next five, five on the eleventh, with the dorsal one 

 large and prominent, six on the twelfth. 



On the eighth day the larvse stopped feeding and showed signs of the 

 first moult ; anteriorly they had a slightly swollen appearance, owing to 

 the head being drawn into and partly under tiie first segment. On the 

 ninth day the swollen appearance increased, and the iarvte diminished in 

 length ; all, with the exception of two, losing the bright ochre-yellow 

 colour, which was replaced by a dull yellowish-brown, shading darker near 

 the base of the tubercles. 



On the tenth day all but five of the larvae had moulted. Immedi- 

 ately after moulting they came out a brilliant orange-yellow, with head, 

 legs and tubercles translucent, and black spines on tubercles. At this 

 stage the length equals 13 mm. On the eleventh day increase in size was 

 the only change noticed. 



On the twelfth day the largest larvse were from 14 to 17 mm. in 

 length, had moulted once, and the colour faded from ochre-yellow to a 

 pale canary, with the joints between segments showing pale pea-green. 

 Head, tubercles, spines and a band near the base of the abdominal 

 legs, also the prolegs, glossy black. 



On the thirteenth day the larv?e were from 17 to iS mm. in length ; 

 no other change ; but on the fourteenth day the largest stopped feeding, 

 evidently ready for the second moult. Head drawn into and under the 

 first segment ; colour pale yellow, with slight greenish tinge between 

 segments. 



On the fifteenth day the largest larvae moulted, changing within two 

 hours to a greenish-yellow, but on the sixteenth day this changed to a pale 

 pea-green, with a slight bluish tinge dorsally and canary-yellow at base of 

 tubercles. The length was from 20 mm. to 2;^ mm. A slight increase in 

 size was the only change noted on the seventeenth day, the largest being 

 from 26 to 29 mm. in length. All the larv?e fed ravenously on Sa/t'x 

 alba (cf. Canad. Entom., Vol. X., pp. 43-44). During the afternoon one 

 of the larvae, a very large one, showed signs of being ready to moult. 



Except for a slight increase in size, no change was observed during 

 the next two days, but on the twentieth day they passed the third moult. 

 Length from 28 mm. to 31 mm.; head yellowish-green, spotted slightly 

 with dark brown ; ocelli black ; prolegs yellowish-green ; thoracic legs a 

 glossy black. Segments clear bluish-green ; first segment with eight black 



