352 THE CANADIAN ENTOMOLOGIST. 



tubercles with black spines ; from the second segment to the tenth, inclu- 

 sive, the two dorsal tubercles bright yellow with black spines ; the large 

 dorsal tubercle on the eleventh segment the same colour ; all the lateral 

 tubercles and all the tubercles on the twelfth segment glossy black, with 

 black spines. 



On the twenty-first day the only change noticed was that the thoracic 

 legs were greenish-yellow with glossy-black tarsi, but on the twenty- second 

 day the increase in size was very marked. The length had increased from 

 36 mm. to 44 mm. At this stage the larvae, when resting, assumed nearly 

 the same position as when ready to moult, but the head was not quite as 

 much withdrawn into the first segment. On the following day the larvae 

 were preparing to moult, assuming the same position as usual, with head 

 drawn into and under the first segment, contracting to the length of 33 mm. 



On the twenty-fourth day the larvae moulted for the fourth time, com- 

 ing out a greenish-slate colour, with head translucent pea-green, dorsal 

 tubercles ochre-yellow, lateral tubercles light blue. On the twenty-fifth 

 day the larvae were from 48 to 52 mm. in length ; head yellow-green ; first 

 segment pea-green; segments 2 to 12, inclusive, slate-green ; segment 13, 

 prolegs and anal prolegs pea-green and sparsely clothed with hairs ; 

 thoracic legs clear green with black tarsi ; mandibles clear green with a 

 slight pinkish tinge. Tubercles on first segment small, glossy black, with 

 no spines ; the two dorsal ones on 2nd, 3rd and 4th large and prominent, 

 ochre-yellow, with side towards head glossy black, with eight glossy-black 

 spines. Two dorsal tubercles on segments 5-10 ochre-yellow, with from 

 one to three glossy-black spines ; large dorsal tubercle on segment eleven 

 ochre-yellow, with eight black spines ; all tubercles on 12th segment light 

 blue, with from two to five spines ; two dorsal tubercles on 13th segment, 

 glossy black, with light blue tips and black spines. Lateral tubercles on 

 segments 2, 3 and 4 light blue, with black spines; on segments 5-10, 

 inclusive, pearl colour, with from one to three spines ; all spines through- 

 out glossy black. 



On the twenty-seventh day length was 52 mm. contracted, 60 mm. 

 extended ; no other change. On the twenty-eighth day a slight increase 

 in size was the only change noted ; but on the twenty-ninth day the in- 

 crease was much more marked. At this time the length was from 68 mm. 

 contracted, to 76 mm. when in motion ; the larvas were very healthy look- 

 ing, and eating most of the time. On the thirtieth day there seemed no 

 change, except that the largest showed less inclination to eat. On the 

 thirty-first day all the larvae were feeding well again, and the length was 



