STATE AGRICULTURAL SOCIETY. 
503 
cavity of the first piece, thus forming a little hollow between, 
within which the worm lies like a clam within its shells. Fi¬ 
nally, covering these two was a third piece still larger, 0.30 to 
0.40 in length, placed on top of the first. The several pieces 
were connected and held together at their edges by fibres of fine 
silk. On the left hand of the leaf, plate 4, fig. 7, shows one of 
these cases its natural size; that on the right hand represents it 
magnified, whilst three cases of smaller sizes are represented 
adhering to the surface of the leaf. Frequently, as is shown in 
these illustrations the largest piece is cut from the leaf where it 
is crossed by one of the coarse veins, perhaps to render the struc¬ 
ture more substantial 
The worm within these cases is nearly a quarter of an inch in 
length when mature. It is slender, and of a flattened cylindri¬ 
cal form, soft and contractile, composed of thirteen segments 
marked by slight intervening constrictions. It is dull white, the 
head, which is strongly depressed, and the three thoracic seg¬ 
ments pale rusty brown. An interrupted broad blackish stripe 
along the middle of the back is more or less distinct. Only the 
three pairs of legs upon the thoracic segments are distinctly de¬ 
veloped. 
These worms, or many of them at least, are carried to the 
ground upon the leaves, when they fall from the trees in au¬ 
tumn. They remain in their oases and change to pupae, among 
the fallen leaves beneath the trees, in which situation they may 
be found early in the following spring. 
The pupae are 0.18 long,pale yellow, and of an oval form, taper¬ 
ing abruptly to a point at their tips. The wings, legs and antennae 
are enclosed in separate sheaths, not attached to each other or 
to the surface of the body. Upon the back each of the segments 
of the abdomen except the two last have a row of minute teeth 
along their anterior edges, inclined backwards, like the points 
of needles. By means of these teeth, the pupa when ready to 
disclose the perfect insect, crowds itself forwards out of its case, 
by bending itself alternately up and down, the sheaths of the 
feet upon the opposite side of the body serving as props to aid 
in effecting this movement. From it comes a small moth of a 
dark brilliant blue color with a bright orange yellow head, 
