RED DNDERWING. 247 
The majority have ten feet, six of which, placed 
upon the pectoral segments, are scaly and conical ; 
the other four are membranous, a pan- of them 
situate near the hinder part of the abdomen, the 
other at the extremity. The abdominal legs are 
sometimes wholly wanting, but the anal pair is 
indispensably requisite to enable the animal to 
execute its peculiar movements. Many of these 
caterpillars feed only in the night, and may be 
obsen'ed during the day, if the eye happen to dis- 
tinguish them from the surrounding tmgs which 
they often strikingly resemble, with their bodies 
suspended in the air. perfectly motionless, forming 
an angle -with the branch to which they cling by 
their hinder prolegs. The moths, however, are by 
no means exclusively nocturnal, and several of 
them may occasionally be noticed on the wing even 
in the heat of the day. Their bodies are generally 
slender, the abdomen of the male terminating in a 
small tuft : the antenna in that sex frequently pec- 
tinated, at other times simple ; the palpi short and 
somewhat cylindrical ; the proboscis occasionally ob- 
solete, — when developed, not very long and nearly 
membranous; the wings ample, and extended almost 
horizontally during repose. The first species selected 
to illustrate this division is named 
