The 
Et UST TORRAY 
of ANS E.Oear §; 
©: EpARE RS. suk, 
A defeription of the external parts of the Caterpillar, and a diffeétion of the in- 
ternal, fo as to give a fatisfattory account of the blood, mufcles, kidney-fhaped 
parts, fromach, gullet, inteftina ceca, or chfed guts, filk-bags, fat, pulmonary 
tubes, heart, brain, and nerues. 
HERE are a great number of Cater- 
. pillars that become, after their change, 
diurnal or day Butterflies, that are found feed- 
ing on nettles, with which they fupport them- 
felves ; fometimes devouring that plant to fuch 
a degree, as to leave nothing but the {talk re- 
maining. It is of thefe I intend to {peak in 
this place. ‘They are very common in Hol- 
land, during the fummer ‘months. The fkin 
of this infect appears thick fet with very fharp 
prickles, Tab. XXXIV. Fig. 1.@. At its full 
growth, it is almoft an inch and a half long. 
It is of adeep brown colour, except on its fides, 
which are of a yellowifh green, fomething in- 
clining to white. Thefe Caterpillars differ fo 
much from each other in this refpect, that, in 
point of colour, it is impoffible to defcribe them 
diftin@ly. This little infect has fix legs on 
that part of the body which is next its head: 
of thefe legs, I have here delineated only the 
three that belong to one fide, 6. The middle 
part of the body is furnifhed with eight legs 
more, four on each fide, ¢; befides which 
there are two others ‘that {pring from the divi- 
fion forming the tail, d. That the conftruc- 
tion of this Caterpillar may be the more per- 
fectly underftood, I fhall reprefent it as it ap- 
pears, fomewhat magnified by a microfcope. 
Thus we fhall fee, that, counting the head a 
tail, it is compofed of thirteen annular divi- 
fions, Fig. 11. 1, 2, 3, 4, &e. Thehead: is of 
a horny fubftance, or like bone, and of a 
fhining black colour; and, here and there, it is 
covered with a kind of hair like briftles. On 
each fide of the head are fix black eyes, ad, 
and under the eyes the antenna, 4. There 
is a lip on the lower part of the divifion which 
conftitutes the head, and under and near the 
lip are placed the teeth, cc. Near the teeth 
are three little protuberant fpots, the middle- 
moft of which is a nipple, or papilla, d, from 
which the Caterpillar emits a kind of thread ; 
which wil! be hereafter confidered. 
There are fome briftly hairs on the fecond 
ring, and under thefe hairs is a black {pot, 
above the firft pair of legs. This is the firft of 
the puncta refpiratoria, or points of refpiration, 
“by which the infect breathes. The legs, e. 
confift of various joints, compofed of a bony 
or horny fubftance; and each is terminated by 
a claw of the fame fubftance, and of a deep 
red colour. There are no openings for refpi- 
ration on the third and fourth rings, as well 
Sefer 
er 
becaufe the wings of the futtire Butterfly lie 
againit thofe rings under the Caterpillar’s flkin, 
as becaufe fuch breathing-holes would greatly 
obftruct the motion of the limbs. The third 
ring has on each fide two fharp and briftly 
hairs, which, at fome diftance from their 
roots, produce many others. The two lower 
of the original hairs, which are likewife the 
leaft, are of a white, and the two upper ones 
of a black, colour. i 
The fourth ring is of the fame fortn with 
the third; but as I have reprefented if‘a little 
fideways, there appears on it only one pair of 
briftles. ‘The legs, Tab. XXXIV. Fig. ir. fg, 
placed on both thefe rings, refemble exactly 
thofe of the fecond ring. Between the hairs 
already mentioned, there are others, which I 
have been obliged to omit in the figure I have 
given, for fear of rendering it confufed. Thefe 
laft hairs are white, and they {pring from 
whitith {pots in the center of a black ground, 
On each fide of the fifth ring there are three 
briftly hairs, with one exaCtly on the middle 
of the infect’s back, 4. The firft and largeft 
pair of thefe hairs, 7, lies a little flanting, on 
account of the fingle hair on the middle of the 
back. The fecond pait, or that next to the 
firft, rifes over the points of refpiration; and the 
third pair, 4, under thofe points, on the deécli- 
vity of the belly. I have, to avoid confufion, 
omitted the lateral prickles; but have repre- 
fented the others juft as they appear, covering 
almoft every ring of the body. The rings 
that follow, all to the thirteenth, are exactly 
of the fame form, with breathing-holes in 
every one cf them; fo that the infect has no. 
lefs than eighteen of thefe openings difpofed 
along its fides, with a blackith edge or border 
to every hole. 
The fifth and fixth rings have no legs an- 
nexed to them ; but the feventh, eighth, ninth, 
and tenth have each a pair, {pringing from the 
lower part or belly of the infe@. Thefe legs 
are covered with a fine membrane, confifting 
of many joints, and are armed with little red 
claws, ////, fet round the extremities of their 
legs. 
The eleventh and twelfth rings are likewife 
without legs. The only pair, in this part of 
the infect, {prings from under the tail, wm. 
The ring, conftituting this part; has but one 
pair of fharp hairs. 
The 
