148 _ NATURAL. HISTORY. 
head, a corflet and a body ; the corflet is that part on which the wing? 
are placed, and the body contains the guts, the ftomach, and the part’ | 
of generation, with the greateft number of trachex, that is the orga 
that ferve for refpiration: the head.is conne@ed tothe corflet by a'very 
fhort neck, on which it will commonly turn round, as on a pivot 
Reaumur obferves, that fome Flies have two corflets, diftin@ from each 
other, of which the firft is fmalleft, and the other is that to which thé 
wings ate connected. The corflet is the roundeft part, and is generally 
flrongeft and thickeft, though formetimes it is not fo broad as the bodys 
~ The Formica Leo and fome water Moths, are metamorphofed into 
Flies, that have a double corflet. Many naturalifts have confounded 
Flies with four wings, with thofe that have but two; befides whichs 
they have often neglected to mention the number of wings ; but Reat” 
mur divides them into two general clafles, that is Flies that have two 
wings, and Flies that have four wings; and under thefe he compre- 
hends four fubordinate claffes. The firft elafs comprehends Flies that 
have a trunk, and have neither teeth nor nippers. ‘The fecond is com* 
pofed of Flies that have a mouth without teeth: The third confifts 
of Flies that have a mouth furnifhed with teeth; and the fourth tholé 
that have both a trunk and teeth. Among thofe Flies that have # 
mouth and teeth, there are fome that have not only teeth on: the out: 
fide of the mouth, but within; and thefe might have been placed if# 
a fifth clafs. f og 
All forts of Flies that have two wing's, belong to the firft and fecond 
claffes, for there are none of thefe that have the characteriftics of the 
two other clafles. The great blue flefh flies, and all thofe thar aré 
fo troublefome in houfes, as well as Gnats, are of the firft clafs; theré 
are alfo Flies that refemble Gnats, which have a mouth without teethy 
and thefe belong to the fecond clafs of two winged Flies. The Flies 
with four wings belonging to the third and fourth, are very numerous? 
fuch as Bees which have a trunk, and two teeth above it, as well a§ 
all forts of Wafps, which have a mouth and two teeth on the outfide? 
“Many forts of Flies with four wings, belong to the fecond clafs, fuch 
as papillionaceous Flies, which proceed from different forts of wate? 
Moths. Many forts of Flies with four wings, belong to the firft clafs 
as the pucerons, called by fome Vine-fretters, and others a-kin to the? 
as well as the Grafshoppers. 
Reaumur has another fort, which conftitutes a fifth clafs, and he calls 
them Heads in a trunk, becaufe they have extremely long heads, fro™ 
whence proceeds a very long fnout, which is only open at the end? 
However he means that the place where the heads of other infeéts tet 
minate, in thefe are prolonged, fe as to form the fhape of a trunks 
which is ftiff, and never changes its form or pofition, without chang” 
ing the head itfelf. It is at the end of this lengthened part, that the 
teeth are placed, or at leat the inftruments by means of which thele 
infects take their nourifhments. One of this fort is the Scorpion File? 
fo called, becaufe the male generally keeps the back part turned up 1” 
wards the back, like that of a Scorpion when it is about to fling. ‘Ihet® 
is another beautiful Flie, which flutters about Howers, that is anothet 
inftance of this kind. j 
Befides thefe clafles Reaumur eflablifhes‘a fecond rank, fabordinaté 
to the frit, and whofe charaderiitics are taken from what appeatt : 
