IMPORTANT CLASSES OF INSECTS 205 
(a) Butterflies usually fly in the daytime; moths in the 
evening and at night. 
(b) When at rest, the wings of a butterfly meet over its 
back in a vertical position; the wings of a moth are spread 
out horizontally or are wrapped 
around the body. 
(c) The feelers of a butterfly are 
thread-like and are thickened at the 
end. The feelers of the moth are 
formed like a feather or they are 
thread-like and pointed. 
(d) The pupa of a moth is ine ae 
closed in a silken cocoon; that of PsecE ora Burrerrty’s WinG 
a butterfly is in a chrysalis, which 9 "@°”%° ROMs SaaS 
is a thin, hard shell and is most commonly of a brown color 
with golden yellow marks upon it. 
The life history of moths and butterflies furnishes a fine 
example of the complete series of changes in insect develop- 
ment. The eggs are laid on all kinds 
of plants and hatch in from twelve 
to fifteen days. The larve, called 
caterpillars, eat ravenously, grow 
fast, molt several times, and in the 
latter part of the summer change to 
the pupa state. This pupa, found 
in the cocoon of the moth and in 
a. b. the chrysalis of a butterfly, lives 
aaa over the winter and in the spring 
a, Butterflies; &, Moths. 445 adult comes forth from it. A 
few species, as the Isabella tiger-moth, pass the winter in 
the larval state. 
Caterpillars vary greatly in size and appearance, but are 
