ARTHROPODA. 
301 
colors, and are often arranged in patterns of exquisite 
beauty. They are in reality modified hairs, and every 
family has its partic¬ 
ular form of scale. 
The head is small, and 
the body cylindrical. 
The legs are of but 
little use for locomo¬ 
tion. All the mouth 
parts are nearly obso¬ 
lete except the maxil¬ 
lae, which are fash¬ 
ioned into a “ probos¬ 
cis ^ for pumping up Pig.2<2. —P<u*t of the Wing of a Moth (Scituvnici) & 
r r 5 r magnified to show the arrangement of scales. 
the nectar of flowers. 
The larvae, called “ caterpillars,” have a worm-like form, 
and from one to five pairs of abdominal legs, in addition 
to the three'on the thorax. The mouth is formed for mas¬ 
tication, and (ex¬ 
cept in the larvae 
of Butterflies) the 
lip has a spinneret 
connected with silk- 
glands. 
There are three 
groups : the gay 
Butterflies, having 
knobbed or hooked 
antennae, and flying 
in the day only; 
the dull-colored Sphinges, with antennae thickened in the 
middle, and flying at twilight; and the nocturnal Moths, 
which generally prefer the night, and whose antennae are 
thread-like and often feathery. Generally, when at rest, 
the Butterflies keep their wings raised vertically, while 
