Thes Hel Ss VT ORY 
Len. ve 7 
There give a figure of the enclofed hidden 
Nymph, as it appeared fomewhat magnified, 
when cut out of the external skin, or that of 
the former Worm, which before covered it. 
Brie. vie and vit. 
Thefe two figures reprefent the fame Nymph 
magnified by the microfcope toa proper degree. 
We may fee in thefe in what manner it is di- 
vided into a head, thorax, and belly, which I 
fhall more particularly explain in the next figure, 
which likewife exhibits the fame Nymph. 
Fig. vit.aa. Are the infect’s eyes feated in 
its head, and formed like a net ; between thefe, 
but lower near the thorax, appears its probof- 
cis, or trunk. 
é. Are two little horns or antenne, which 
arife from the upper part of the head. 
cc. The folded ‘legs rifing from the thorax, 
three on each fide. 
dd. The folded wings, between which the 
extremities of the legs are clofely arrayed. - 
e. The annular divifions of the abdomen, and 
certain prominent tubercles upon the edge of 
it, being what remains after the infect cafts the 
skins of the feathered protuberancies of the 
Worm and Nymph, which I have abovemen- 
tioned. Thefe tubercles difappear when the 
creature aflumes the.form of aFly. ‘They are 
either entirely deftroyed by the evaporation of 
the humours, or thrown off by the hairs that 
grow in this part. Itis a very tedious and dif- 
ficult task to diffect the real Nymph of the ten- 
der membranaceous skin, which immediately 
covers it under the outer integument, without 
either hurting or difplacing its limbs. 
pig ey anv ikem 
This figure exhibits, larger than life, the 
Nymph free from its two covérings, and 
changed to a Fly; but it muft be obferved, 
that it does not, on parting with its fkin, fold 
or curl them up, as Hornets and Bees do ; this 
creature only breaks them near the place where 
its head lies, and leaves the cafe unimpaired 
in every other refpect: fo that on fecing one 
of thefe deferted coverings, one would be apt, 
at firft fight, to take it for an entire Nymph. 
This Fly, which from the form and condition 
of a contemptible and filthy bog-houfe Worm, 
is changed to an inhabitant of the air, thus 
making mifery its-way to happinefs,.1s divided 
in a very diftinét manner into the head, the 
thorax, and the abdomen. 
Fig. viri. aa. In the head are two eyes 
formed like an elegant piece of net-work, and 
of a purplith colour. Thefe eyes are feparated 
by two very elegant zones of a filvery white- 
nefs, in the part where they come neareft to 
one another. 
b Between thefe filvery zones, on the forepart 
of the head near the eyes, are the infect’s two 
horns, or antenne. 
cc It has likewife two membranaceous wings 
fixed to the fhoulder-blades of the thorax. 
dddd Are fix legs covered with ftiff hairs ; 
of PT NUGSE'C Os. 4t 
thefe are articulated with the lower part of the 
thorax, and they confift each of four joints : 
that which forms the foot, properly fo called, 
is again divided into feveral lefler joints. We 
may, befides, fee very diftinctly, that every leg 
has diftin¢tly two claws at its extremity, and 
that thefe claws are parted by fome hairs that 
grow between them. 
e Here we may fee the rings and variega- 
tions by which the abdomen is divided. They 
are covered with hair refembling briftles. In- 
deed, the whole body is thick fet with this kind 
of hair, and it is of a blackifh gray, without 
any other particular ornaments of colour, tho’ 
in many other Flies we perceive a moft deli+ 
cate mixture and combination of colours ; fa, 
that the Fly now under confideration, deferves 
only to be ranked amongft the moft ordinary _ 
fort. 
Eve was 
Finally, to give a perfedct idea of this fourth 
order of mutations, I fhall add a fuccinét ac- 
count of two particular Nymphs, which be- 
long to it, tho’ under the fecond mode; for 
thefe Nymphs differ greatly from thofe of the 
fame order already defcribed : they are altered 
in a great meafure from the fhape they had in 
the Worm ftate, tho’ one of them much more 
than the other; the reafon of which variation 
I fhall likewife endeavour to point out. 
Tab. XXXVIII. Fic. rx. A. 
The Worm here reprefented, is the fame 
with that of which Goedaert has given us a 
defcription, and a figure in the firft part of his 
work, obfervation 11, but without taking any 
notice of its feet or horns, both which he over- 
looked. I cannot fay, that I have myfelf 
counted thefe feet in a living Worm; but on 
examining a preferved one, and its Nymph, 
there appear feven on each fide, and thofe are 
all armed with fome little claws. Thefe feet 
are very fhort, and {carce vifible, except when 
the infect extends and thrufts them out. Goe- 
daert does not deny the exiftence of thefe feet, 
in his Dutch work, publithed under his own 
infpection, but his Latin tranflators do it for 
him: from whence it plainly appears, that 
thofe gentlemen, who have likewife added 
their own obfervations to Goedaert’s work, 
have difg-aced his performance by a great 
many errors and miftakes. We have reafon 
alfo to lament, that this induftrious naturalit 
employed others to write, even in Dutch, the 
obfervations which he had made in this pro- 
vince of natural hiftory. We mutt expect to 
find their particular opinions frequently inter- 
mixed with. thofe of the illuftrious original 
writer. But be that as it will, one thing is 
certain, that the original Dutch is preferable 
in correctnefs, and other refpeéts, to the Latin 
tranflation. 
The two antenne, or horns of this Worm, 
which it carries‘on the forepart of its head, and 
its Jong tail, which it fometimes twifts and 
turns about in a very furprifing manner, con- 
ae greatly to give it a fingular and pretty 
appear 
