ATTACKING THE LEAVES. 



79 



of this parasite is a fat, flesliy, footless grub, of a translucent 

 yellow color, and about half an inch in lengtli. A third para- 

 site is a small four-winged fly, known as the Cecropia Chalcis- 

 fly, Sniicra marise (Riley) (Fig. 75). In the figure the fly is 



Fig. 75. 



Fig 76. 



much magnified ; the short lines at the side show its natural 



size. A fourth friendly helper is an Ichneumon fly, known 



under the name of the 



Cecropia Cryptus, Cryptus "' 



extrematis Cresson, which 



infests the Cecropia larva 



in great numbers, filling its 



chrysalis so entirely with 



its thin, papery cocoons 



that a transverse section 



bears a strong resemblance 



to a piece of honey-comb. 



(See Fig. 76.) The flies of 



this parasite escape in June, 



the female presenting the 



appearance shown in Fig. 



77, where it is much mac:- 



nified, the short line at the side showing its natural size. 



Another two-winged parasite is Gaurax anchora Loew. 



While very partial to the apple, the larva of Cecropia will 

 also feed on the cherry, plum, pear, maple, willow, lilac, Eng- 



