INSECTS INFESTING FRUIT TREES. 
THE APPLE. 
AFFECTING THE LEAVES. 
Consuming the leaves of apple and cherry trees in May, and forming largo 
cobweb-like nests in the forks of the limbs; black, hairy, caterpillars, 
witli white lines and along each side a row of blue spots; living 
together in societies. 
The Common Apple-tree Caterpillar, or American lackey moth, 
Clisiocampa Americana, Harris. (Plate 3, fig. 3, the male; fig 4, 
the female.) 
There is scarcely an insect in our country more universally 
known than is the one which we are now to consider, when in 
its larva state, it being the common caterpillar, whose cobweb 
like nests are everywhere seen, in the month of May and the 
fore part of June, upon apple and cherry trees. But, though 
every person is so well acquainted with these caterpillars, there 
is not one of our citizens who knows the moth or miller into 
which they change; and those to whom I have shown this miller, 
have generally expressed their disappointment at finding it so 
small, so dull colored, and so little ornamented with spots or 
marks, they having supposed from the size of the caterpillar, 
and the colors with which it was variegated, that it produced a 
much larger and more gay looking insect. 
This insect pertains to the Family Bombycidje, or the thick, 
hairy bodied moths of the Order Lepidoptera, the silk worm 
(Bombyx Mori ) being the type of this group. And the moth of 
our apple-tree caterpillar in its size and general appearance has 
much similarity to that of the silk worm, though differing from 
>t notably in its color, and also in some of the minute but im¬ 
portant points in its structure, which cause it to rank in a dis- 
