Ee Ard 
GE New Ss E.. 
SAS Wes Bes Es OX 
TE NE Bik E Dro; 
@haraGler of the Genus. « 
The Mourn is form’d of Jaws; and has no Trunk. 
The Scurcueon, has. two finall, diftant, elevated points, on its hin- 
der part. 
The WinGs lie plain; but area little puff’'d up, and uneven. 
The Weapon at the tail is fhort;. and form’d. of two plates, jag- 
ged like a Saw ; and hollow’d lengthwife in the Female. Plain in 
the Male. Plate 1. abcd. 
All two-wing’d Flies havea pair of Plummets behind their Wings ; 
rifing from under a-bloated Scale. Thofe fwellingsin-the Saw-Fly feem 
to be {uch Scales not open’d ; and never difclofing any Plummets. 
Nature does all things regularly; and makes her advances 
by equal and gradual degrees: and this feems her gradation from 
the two-wing’d. to the four-wing’d Claffes of Infects; the. firft 
in. which the Plummets. ceafe, 
We fhall find throughout her univerfal regions, that creatures 
differ: by equidiftant fteps from one another; and that this dif- 
ference, this advance of Species above Species, is all her laws allow. 
All real knowledge of her works is, and for ever will be, confined 
to this; the knowing and eftablifhing the differences of one Species 
from another: Clafles, and Genera, tho’ ufeful, are. arbitrary ; 
ideas-of mens- minds ;- that -exift not in nature. 
To know thefe characters. of difference, is all: but the parts: 
which mark them ; the greater, as well.as the leffer ; are fo imper- 
fectly feen in the fmaller Infe@s, that. their names, or-kinds, often 
cannot be known; nor: does the mind perceive the- wonders of 
the Creator difplay’d in.thefe his creatures. "Tis therefore they are 
here reprefented both in their natural fize;- and. as. they appear 
hefore a fmall, but diftin@ magnifying power: and that way only 
they can be either well_known, or juftly admir’d. 
IL MOURN- 
