456 
ANNUAL REPORT OF NEW-YORK 
HICKORY. LEAVES. 
its silken threads draws two or three twigs together sufficiently 
to tie its cocoon between them, in which cases it does not fall to 
the earth with the fall of the leaves in autumn, but is very apt, 
by remaining exposed in the tree, to be perforated and have its 
inmate destroyed by woodpeckers. 
It is remarkable that two insects which are so similar in their 
preparatory states that their larvae differ only by slight and un¬ 
important marks and their cocoons cannot be distinguished from 
each other still come to be so unlike each other in their perfect 
state as is the present species and Luna. The fact shows that the 
metamorphoses of the insects of this order is not so accurate a 
guide to their correct systematic arrangement as many have 
assumed it to be. This species having wings without tails and 
with glassy spots in their disk will pertain to Duncan’s genus 
Hyalophora, but as the type of this genus ( Jltlas ,) has the glassy 
spots large and angular, whereas here they are small, round and 
eye-like, it should probably form the type of a distinct genus. 
The larvae of this species and Luna are naked, except that fine 
hairs scarcely perceptible to the eye are scattered over the sur¬ 
face, at least upon the back, and one or two bristles are given out 
from each of the elevated dots. But I have met with larvae upon 
the hornbeam and the butternut which I supposed to be the Luna, 
in which both when young and mature the surface was covered 
with numerous erect clavate scales, like short bristles gradually 
thickened towards their tips. Whether the moths from these 
larvae are in any respect different from those which come from 
naked larvae I hope to ascertain from SDecimens which are now 
in their pupa state. 
182. Reoal hickory Mora, Ceratocampa regalis, Fab. (Lcpidoptera. Bora- 
bycidse.) 
In autumn, a very large apple-green worm, the largest larva in 
our country, measuring live or six inches in length and nearly an 
inch in thickness, with blue-black spots and rows of prickles and 
anteriorly several long orange-yellow horns tipped with black and 
studded with numerous black prickles, four of the upper ones 
longest, the head and feet also orange-yellow; lying under the 
ground in its pupa state through the winter, the moth coming 
