A Short Explanation 
alge inne 
z A little lid or cover, which the Flies at their 
firft appearance thruft out of their web, as 
out of a little barrel. , 
Tod GG. vale 
A microfcopical view of avery finall infect, which 
refts on the external furface of the Willow tu- 
bercles or warts. 
Bol oGar Valk 
lit 
The littl Worm found between the coats of Willow 
leaves, of its natural fize. See Fig. I. let. zz. 
FeI"G. IX. 
A microfcopical view of the fame Worm. 
a The head and two teeth. 
é 6 Its broad thorax, and tranfparent pulmo- 
nary fibres. 
cc The other rings of the body, which is co- 
vered with hair, and ends in a pretty fharp 
point. 
Bi lgG@e WX. 
The Nymph, in which the Worm 1s afterward 
exhibited changed, a little magnified. 
PobiG a AL. 
The fame Nymph more magnified. 
a Two crooked briftles on the head. 
66 Its horns and antenne. 
ce The fecond and third pair of legs: The 
fecond is armed with two briftles. 
dd Two sheaths to cover the wings. 
ee The third pair of legs, and their briftles. 
JF The wings of the body, and the prickles and 
— ftings of the tail. 
Sip BG XH. 
The Beetle produced by the faid Nymph. 
| Poles HE 
_ The fame Beetle magnified. 
a Its reticulated eyes. 
4 Its fnout or beak, of a fubftance between 
bone and horn. - 
ec Its antenne or horns. 
ddd Xts fix Feet, upon the leaft pair of which 
this infect makes it {prings or leaps. 
ee The theaths of the wings. ' 
Beas 2 XI 
Rudiments of Willow leaves juft beginning to foot 
or Dua. | 
a Four of there young leaves, with their ftalks 
and rough furfaces. 
4b Red Worms, generally found within the 
‘leaves. 
of the TABLES 
Fl G.’ XV. 
A microfcopical view of a Fly produced by one of 
the Worms. 
PUG. Sve 
Ai tubercle or wart growing in the Willow in form 
of a rofe. 
@ The tubercle and its ftalk. - 
6 A pyramidal clutter of leaves, within which 
the Worm lies. ein 
HT Gate vans 
Reprefenting in five figures all the changes of the 
; Worm, and its tubercle, . 
c The manner in which the leaves of the tu- 
bercle may be feparated one by one. 
d Part of the Worm’s body, that lies in the 
middle of the clufter. 
e A delicate membrane or web, more imme- 
diately enclofing the Worm. 
J The Worm itfelf, g Its Nymph. 
4 The Fly to which the Nymph changes. 
Poi G. vil: 
An Alder ‘leaf with various Worms between its 
two coats. 
a The coat of an Alder leaf {welled into a tu- 
bercle, on account of the Worm that had 
made its bed under it. 
b 6 The upper coat or fkin removed, in order 
to fhew on each fide, how the other coat is 
contracted underneath into a {mall fold. 
e The web enclofing a Chryfalis, difle@ed ; 
-and near it the excrements of the Worm 
formerly contained between the two coats of 
the leaf. 
d Another Worm with frx feet, found like- 
wife between the coats of the Alder. 
e A third fpecies of Worms found in the fame 
place, with the fkin caft by it, and its ex- — 
crements. 
J ‘Two oblong webs made in their cells by the 
faid Worms. 
g Part of the leaf, where the fame Worm is 
found, when as yet very fmall. 
bh The fame part, where the Worm has made 
itfelf more room. 
i Another cell or neft like the foraied but a 
great deal more {pacious. 
eG. Ke 
A microfcopical view of a Chryfalis found in its 
web within the coats of an Alder leaf. 
a The fharp pointed head of this Chryfalis. 
6 ‘The hinder part of its body, formed like a 
pear. 
ce Fine 
