658 The Maple-Tree Bark-Louse. [| October, 
the dead body remaining attached to the limb by means of the cot- 
tony secretion. Athough the antenne and legs do not develop 
in the same degree with the body, they are not entirely useless, 
since by removing a grown female in the spring from the limb 
the insect will move slowly, even though in their natural condi- 
tion they cease all movement after settling down in the autumn 
upon the limbs. 
The young lice first appear about the middle of June, and: are 
more than twice as long as broad. They are light sordid yellow, 
translucent, elongated-oval, tapering slightly toward the posterior 
end, with seven abdominal segments,the division lines being darker 
and plainest in the middle. Short hairs project from around the 
margin at regular intervals. 
he antennæ and legs are situated some distance from the 
margin and are inserted on the underside of the body. The an- 
tennæ are armed with several strong spines and are jagged in 
outline. The legs are stout, terminating in a single curved claw 
and four knobbed hairs. 
he beak is a long thread-like organ, very minute, and until the 
young louse becomes stationary is folded in a loop in the abdo- 
men. At thè end of the abdomen, arising from tubercles, projects 
two anal appendages or setæ longer than the entire body which 
disappear in a short time. In the natural condition the young 
insects settle down upon the leaves of the maple within three days 
after hatching, the preference given the underside and near the mid- 
rib, although they are found upon the upper side to some extent, 
probably because the epidermis is more tender on the under side 
and they are there protected from the sun’s rays. The beak is 
at once withdrawn from its retreat and is inserted in the leaf, 
when the insect increases rapidly. 
When in a state of rest the young lice draw the antennæ under 
and parallel with the last joint of the fore pair of legs. The two 
(oa ee pair extending backward. 
Although they seldom leave the first assumed position until 
obiti, they have full use of their legs, since when the leaf is de- 
aoa from the tree, the young lice will withdraw their beaks 
and move quite actively about in search of fresh food. When 
"first hatched the males and females are not easily distinguished 
from each other; they soon, however, present quite a difference, 
3 males becoming longer, lighter in color and somewhat 
gher than the iers, and two anal setæ are seen projecting 2 
