ORGANS OF INSECTS DESCRIBED. 
7 
spots ; and grubs, after their first transformation, are often 
named nvmplis, for what reason does not appear. At the 
end of the second period, bisects again shed them skins, and 
come forth ftdly grown, and (with few exceptions) provided 
with wings. Thus they enter upon their last or adult state, 
wherein they no longer increase in size, and daring which 
they provide for a continuation of their kind. This period 
usually lasts only a short time, for most insects die imme- 
diately after their eggs are laid. Bees, wasps, and ants, 
howeyer, which fiye in society, and labor toorether for the 
common good of their commmiities, contmue much longer 
in the adult state. 
In udnged or adult insects, two of the transyerse incisions 
with which they are marked are deeper than the rest, so,that 
the body seems to consist of three principal portions, the first 
whereof is the head, the second or imddle portion the thorax, 
or chest, and the third or hindmost the abdomen, or hind- 
body. In some wingless insects these three portions are also 
to be seen; but in most young insects, or larvae, the body 
consists of the head and a series of twelve rinos or semnents, 
the thorax not being distinctly separated ft’om the Innder part 
of the body, as may be perceived in caterpillars, giubs, and 
macjo-ots. 
The eyes of adult insects, though apparently two in num¬ 
ber, are compound, each consisting of a great number of 
single eyes closely united together, and incapable of being 
rolled in their sockets. Such also are the eyes of the larvae, 
and of the actiye pupje of those insects that undergo an 
imperfect transfonnation. ^loreoyer, many winged insects 
haye one, two, or three httle single eyes, placed near each 
other on the crovm of the head, and called ocelli^ or eyelets. 
The eyes of giubs, catei*pillars, and of other completely trans¬ 
forming lary£e, are not compound, but consist of five or six 
eyelets clustered together, without touching, on each side of 
the head; some, however, such as maggots, are totally blind. 
Near to the eyes are two jointed members, named antennce^ 
