460 A DESCRIPTION OF 
however, call these animals the articulata, and they con- 
fine the term Insect to those creatures which undergo 
metamorphoses. 
These Insects have all six legs, and two antennse or 
feelers ; and though the transformations they undergo, 
differ slightly in the different kinds, the following is the 
crder in which they occur: the perfect insect lays eggs, 
which when hatched produce larvae ; which are called 
grubs when they belong to beetles, maggots to flies, and 
catterpillars to butterflies. These larvae eat voraciously ; 
and, as they rapidly increase in size, they generally moult, 
that is, change their skins two or three times. When the 
larvae are full grown, they go into the pupa state, in which 
they remain torpid and without food for a considerable 
length of time, sometimes first spinning a loose cover- 
ing for the pupa called a coccoon. The pupa is gen- 
rally called a chrysalis ; but it is also sometimes called a 
nymph, and sometimes an aurelia. The last transfor- 
mation is when the insect breaks from its covering in a 
perfect form, when it is called the imago. The perfect 
insect is divided into three segments, or parts, called the 
head, the thorax and the abdomen. 
ORDER I. olcoptcra, or 
THE larvae of the beetle is a grub, which generally con- 
tinues in that state three or four years, eating voraciously 
