101 
}. The usual method of prevention recommended is that of re- 
l.'mg the egg clusters in the fall. The eggs are laid by the female 
Q the outer surface of the cocoon from which she has just 
. rged, forming very conspicuous objects upon the leafless limbs 
i they do not hatch until May or June, they may be removed at 
time m the winter or early spring. Doubtless, if this has been 
ected, the spraying of the foliage during the months of June or 
member with Paris green or London purple, suspended in water 
let also be a perfect remedy. 
||* -Yyg..- • - , 
The Bag- worm (Thyreodopteryx epliemerceformis, Haw). 
Fig. 21.—The Bag-worm, (Thyreodopteryx ephemerceformis 
Haw), a, Larva, fully grown; b, male chrysalis; c, female 
moth; d, male moth; e, bag containing female chrysalis 
with eggs, f y fully grown lurvci currying its bug; o youn^r 
worms. . ^ ^ 
N 
e general abundance of this pest upon cedars and some other 
in Southern Illinois calls for special mention. The small 
f al hags, attached to the twigs of the tree, cannot be mistaken 
i nvthing else. Many of these contain the eggs, which remain 
iighout the winter and hatch in the following May. They may 
Liquently be removed and destroyed by hand in the winter and 
v g, or the trees may be protected by spraying with Paris oreen 
per similar poison in June or July, when the worms are eat- 
j he leaves. 
