THE CANADIAN ENTOMOLOGIST. 29 



lenticular side pieces by distinct sutures. On the ventral surface of the 

 abdomen, underneath the operculum, is a pair of spines, one on each side, 

 about equal in length to those which arise at the anterior end of the 

 prostomial plate. These spines extend backward, reaching nearly to the 

 caudal margin of the body. The segmentation below is not as distinct as 

 on the dorsal surface. Each antenna arises on a line with the coxae of the 

 legs of its respective side of the body and about opposite the anterior 

 margin of the prostomial plate. They consist of four segments : the 

 basal segment is short and stout ; the second segment is twice as long 

 as the first and more slender, reaching about to the margin of the body 

 when the antennae are directed outward; the third segment is very short 

 and with two or three apical spines ; the fourth segment is twice as long 

 as the second, bearing a small spine at about two-thirds the distance 

 toward the tip, and another larger one at the tip. 



The colour of the larva is pale green, semitransparent, with two 

 internal orange-yellow bodies of irregular rounded form, situated one on 

 each side in the basal abdominal region. 



The length in this instar varies from .29 to .35 mm.j the greatest 

 width, from .16 to .18 mm. 



The young larva is capable of crawling as soon as it emerges from 

 the egg. It may crawl a short distance before settling down, or it may 

 settle down quite near its place of birth. It is seldom able to crawl over 

 the larger ribs of a leaflet, being prevented by the thick hairs of the leaf. 

 After settling down it soon loses the use of its legs, and in the course of a 

 day or two the lateral wax secretion appears. The first moult takes place 

 in about five or six days. Lateral growth of the body between the moults 

 is not appreciable, increase in size seeming to result almost entirely from 

 growth in thickness. This is true of all the immature stages. Preliminary 

 to moulting, the skin appears to split around the anterior margin of the 

 body. It is then gradually moved back, aided by up-and-down move- 

 ments of the abdomen, and usually drops off entirely, sometimes, 

 however, remaining attached to the leaf Moulting appears to be a slow 

 process, two or three hours or a whole day intervening before the insect 

 is entirely freed from its moulted skin. As each portion of the body 

 becomes free from the skin, it seemingly flows out over the surface of the 

 leaf, and immediately assumes the form and horizontal dimensions which 

 continue throughout the instar. 



