Hhe Harvejl Bug . 393 
perhaps the Flies of which thefe are the 
Worms, or the Nymphae, may vary in Eng* 
land from thofe in France , where certainly 
they are more common than here. The 
principal Difference is in the Legs, of which 
this had only fix Pair, his feven : the Ends 
of them were fet round with Hairs, and juft 
under the Tail was a lingular Fin, double, 
joined at the lowed: Part in an acute Angle, 
and from thence growing finaller ’till it came 
to the Body. By Means of this Fin, as a 
Rudder, it fleered itfelf in the Water, on the 
Surface of which it kept the Extremity of 
its Tail : and when Water was added, it 
lengthened its Tail as much as it could: and 
O 
if that did not reach the Surface, it raifed 
itfelf higher, exactly as Monjieur de Reaumur 
obferves, and about the fame Length, (near 
live Inches,) before the In fed! was obliged 
to leave the Bottom of the Glafs. 
I fhall now defcribe an In fedt not found 
in Water, and very common in Time of 
Harveft, but of which I have never feen any 
Drawing or Account. It is called the Har¬ 
vejl Bug : is of a bright red Colour : fo very 
fmall as to be imperceptible to the naked 
Eye, and on the Point of a fine Needle re- 
fembles a Drop of Blood. A Drawing taken 
from the Infedt preferved in a Slider, and 
greatly magnified, is given Jig . n. 
I had often heard of thefe Infedts, but did 
pot give intire Credit to what I heard, ’till a 
Lady 
