162 IjORYCAMPA REGALIS. 
behind, yellow. Abdomen reddish-brown, each seg- 
ment with a yellow band. The female often mea- 
sures half a foot between the tips of the wings, the 
male somewhat less. 
The caterpillar when full grown is about fire 
inches and a half in length; of a yellowish-green 
colour, inclining in some places to blue, each seg- 
ment armed with a few black setose spines. On 
the three segments immediately behind the head, 
the spines are of very great length, curved and 
granular, the upper half black, the under reddish- 
yellow. 
