[ 4 J 



Q ■ E N U S I,. 



SAW-FLY. 

 T E N T H R E D O, 



Character of the Genu?.. 



The Mouth is form'd of Jaws; and has no Trunk. 



The Scutcheon, has two fihall, diftant, elevated points, on its hin- 

 der part. 



The Wings lie plain; but are a little puff' d up, and uneven. 



The Weapon at the tail is fhort ; and form'd of two plates, jag- 

 ged like a Saw ; andhollow'd lengthwife in the Female. Plain in 

 the Male. Plate i. abed. 



All two-wing'd Flies have a pairof Plummets behind their Wings ; 

 rifing from under a bloated Scale. Thefe fwellings in the Saw-Fly feem 

 to be fuch 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 Clafles of Infects j the. frrfr. 

 in which the Plummets ceafe. 



We mall find throughout her univerfal regions, . that creatures 

 differ by equidifcant 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 : Claffes, and Genera, tho' ufeful, are arbitrary j 

 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 Infects, 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 

 before a fmall, but diftinct magnifying power : and that way only 

 they can be either well known, or juftly admir'd. 



I. MOURN- 



