292 COMPARATIVE ZOOLOGY. 
in the middle, and flying at twilight; and the nocturnal 
Moths, which generally prefer the night, and whose anten- 
nx are thread-like and often feathery. Generally, when 
Fig. 267.—Fruit-moth (Pyralis pomona): b, larva; a, chrysalis; ¢, imago. 
at rest, the Butterflies keep their wings raised vertically, 
while the others hold theirs horizontally. The pupa of 
the former is unprotected, and is usually suspended by 
Fig. 268. —Head of a Caterpillar, from 
beneath: a, antenne; b, horny jaws; 
ce, thread of silk from the conical fusn- 
lus, on either side of which are rudi- 
mentary palpi. 
a bit of silk: the pupa of 
the Moths is inclosed in a 
cocoon. 
From 22,000 to 24,000 
Lepidopterous species have 
been identitied. Some of 
the most common Butterflies 
are the swallow-tail Papilio, 
the white Pzerds, the sulphur- 
yellow Colzas ; the Argynnis, 
with silver spots on the un- 
der side of the hind wings; 
the Vanessa, with notched 
wings. The Sphinges exhib- 
it little variety. They have 
narrow, powerful wings, and 
