400 
LEPIDOPTERA. 
same family, the feelers in this are distinct, cylindrical, and 
prominent, and the front edge of the hind wings does not 
seem to be formed to extend beyond that of the other pair 
when the wings are closed. It expands from five to six 
Fig. 194. 
inches. In the year 1828, I found three of the eggs of this 
fine insect on the black walnut on the 20th of July and 
the 4th of August. They were just hatched at the time, 
and the caterpillars were near to them resting on a leaf. 
The position of these young insects was so peculiar as to 
attract attention, independently of the long branching spines 
with which the fore part of their body was armed. They 
were not stretched out in a straight line, neither were they 
hunched up like the caterpillars of the Luna and Polyphe¬ 
mus moths ; but, when at rest, they bent the fore part of 
the body sideways, so that the head nearly touched the 
middle of the side, and their long horn-like spines were 
stretched forwards, in a slanting direction, over the head. 
When disturbed, they raised their heads and horns, and 
shook them from side to side in a menacing manner. These 
little caterpillars were nearly black; on each of the rings, 
except the last two, there were six straight yellow thorns 
or spines, which were furnished on all sides with little sharp 
points like short branches. Of these branched spines, two 
