172 



AGRICULTURAL EXPERIMENT STATION. 



lice have two projections, one from each side of the hinder part of 

 the body, called nectaries or honey tubes from which a sweet fluid 

 is secreted in some quantity. Ants gather in great numbers to feed 

 upon it and will even strike the lice with their antense causing them 

 to give out the fluid. The normal use of this fluid is probably to 

 feed the young lice. 



The natural enemies of the plant lice are many. Several species 

 of lady-birds prey upon them. One of these, the Fifteen-spotted 

 Lady-bird is shown in Fig. 23, where the larve (a), chr^'salis (b), 



FIG. 23. 



and several forms of the perfect insect (d, e, f, g) are represented. 

 The larva of the Lace-winged or Golden-eyed Flies feed upon the 

 plant lice. These flies may be known by their light green gauzy 

 wings and offensive odor when disturbed. Their eggs are raised on 

 little stalks and are found in clusters. The larva of the Syrphus 

 Flies also devour plant lice. These flies deposit their eggs among 

 the plant lice and the blind larva hatched from them wander about 

 devouring an}' lice they chance to meet. These flies may be known 

 by their black color, clear wings and yellow stripes crossing the body. 

 A tree affected by plant lice can be distinguished by the twigs and 

 leaves being distorted and twisted backward. The lice find shelter 

 under the distorted leaves. Scraping the loose bark from the trunks 

 and branches in the winter and washing with soap suds will help 

 destoy the eggs. 



THE CODDLING MOTH. 



Gorpocopea Pomonella, (Linn.). 

 The habits of this pest are too well known to need detailed 

 description. We give a figure which shows the perfect insect (g) 



