148 NATURAL HISTORY. 
X ; 
rent manner from the reft ; for they proceed’ as if they. were meafuring — 
the ground as they go; for which reafon they are called furveyors. . 
The feventh clafs have no intermediate feet, they having but eight 
in all, that is fix that are fhelly, and the two hindermoht. Mr Reaumur. 
places in this clafs, the greate!t part of Moths, they having only fix’ 
fhelly, and fix hinder legs, that is {peaking in general, for fome have 
eight intermediate legs. He will not allow any to be Caterpillars, that 
have not eight legs at leaft; though Ray places in that number, fome 
that have lefs than eight. 
There is a very great difference among Caterpillars, the. principal of 
which is the fize and colour. ‘Thofe of the middle fize, are about an 
inch long, and the diameters of their bodies is little lefs than a quarter 
of aninch. Some are only of one colour, others of different colours, 
fome of which are very lively and well determined, others are placed 
in itreaks of different kinds, running fometimes one way, and fome- 
times another; and fometimes again undulated or fpotted. Thefe dif- 
ferences of their colours, and the manner of their being placed, ferve 
to diftinguith their kinds; though there are fome that are entirely greeny 
and others all over brown. : 
Caterpillars are alfo diftinguifhed into thofe that are naked, and hairy; 
for the tkin of moft part of the firlt kind is folt to the touch, but the 
others are rough, with hard grains; for which reafon, they are called 
by fome fhagreened Caterpillars ; and feveral of thefe have a horn on. 
the eleventh ring, which charaéerifes a diflina kind. Some place thofe 
among the naked kind, that are full of round tubercles, and which 
eomprehends molt of the large kinds, that produce the moft beautiful 
Butterflies. ze van : 
The thorny Caterpillars are fo, called, becaufe they are rough with 
fuch hard and thick hair, that they refemble thorns or prickles, exa@ly 
like thofe on plants. The hairy Caterpillars are fo very different, fome 
of them being extremely beautiful, and others exceeding ugly, that 
they may be looked upon as diftin? kinds, though they are generally 
known among us by the name of Palmer Worms. 
With regard to the fhape of Caterpillars; fome are more flender be- 
fore than behind, and others the contrary. Some are in the thape of 
fifth, and the bodies of others terminate in a kind of fork. — 
Some Caterpillars when you are about to take them, roll themfelves 
up in rings; and when thofe that are hairy do the farne, they look like. 
{mall hedge-hogs. Others fall to the ground when the leaves are touch- 
ed on which they are feeding; and others again endeavour to fave 
themfelves by running away. © 
_ When Caterpillars are metamorphofed fir, they have neither feets 
‘wings, nor motion, nor do they take any nourithment; and then they 
have the name of a Chryfalis, Nymph, or Aurelia. The Chryfalis 
which proceeds from the flough of a Caterpillar, is tender and foft at 
firft, but becomes fo hard at length, that it is brittle. Some of thefé 
Aurelias are all over hairy, and others feem to be thagreened; there 
are likewife varieties in their fhapes, in their fizes, and the arrangement 
of the prominences on their bodies; they are alfo of different colours: 
The Caterpillar of the apricot-tree is of a purple colour, and marke 
with red points. It has four tufts of red hair on its back, like the — 
oats of a boat; and there are two more on the head, which make 4 
: cae for’ 
