SEPTEMBER. 
809 
C. — A caterpillar of very singular appearance^ I shook 
from a rough-leafed willow. It was about two inches and a 
quarter long^ very soft, the belly flat like that of a leech ; 
all smooth, except a tuft of white hairs on each segment at 
the edge of the belly ; the head downy. The colour was 
light grey^, beautifully mottled and chequered with black ; 
the third segment was separated from the second and from 
the fourth by bands of bright orange^ which appeared only 
when it crawled ; the whole under surface was mottled with 
black and tawny. It has since spun a slight cocoon. Per- 
haps it was a Catocala, But the largest and most beautiful 
caterpillar that I have yet seen^ is one of the great Satuv" 
nice, which I found about a week ago, resting on a Choke 
cherry bush (Prunus Serotina), It is of a most brilliant 
light green,, nearly transparent ; each segment of the body 
rising into two roundish humps^ each ending in a little bright 
yellow tubercle^ bearing two or three short hairs ; two rows 
of similar tubercles run down each side^ which are joined by 
a diagonal yellow line on each segment^ just behind which 
are the spiracles^ which are scarlet. The head and legs are 
light brown ; the anus is terminated by a line of purplish 
brown. It is rather inactive^ and slow of motion. Its 
lengthy when crawling, is two inches and a half, and its dia- 
meter about half an inch. 
F, — It is the larva of an exceedingly large and fine moth, 
{Saturnia Polyphemus). 
LARVA OF SATURNIA POLYPHEMUS. 
