2oS Of the Ox-Fly, or Gad-Bee. 
The Eggs of this Infedl are depofiteef in 
the Waters, and produce an extraordinary 
Kind of little Worm or Maggot , the Extre¬ 
mity of whofe Tail is incircled with move¬ 
able Hairs, which, being expanded on the 
Surface of the Water, enable it to float along., 
as * in Plate VII. Fig. XIII. a. When it 
would defcend towards the Bottom, thefe 
Hairs are made to approach each other in an 
oval Form, and inclofe a little Bubble of Air; 
hy Means whereof it is able to rife again : 
and if this Bubble efcapes, as fometimes it 
will, the Infedt immediately fqueezes out of 
its own Body another like Bubble to fupply 
the Place thereof. The Maggot , as defend¬ 
ing, is fhewn Fig. XIII. b* Its Snout has 
three Divifons, whence three little pointed 
Bodies are thrufb out, in continual Motion, 
like the Tongues of Serpents. 
Thefe Maggots are frequently to be met 
with in Water taken from the Surface of 
Ditches. The Motion of their Inteftines is 
perfectly lingular and diftinguifhable, and 
they are O.bjedts well deferving our particu¬ 
lar Obfervation. 
* Yid. Swammerd. Hi/. Generate des Infettes , p. 148. 
■ v . * >' -i ‘' •' - •' ' ■ * 
f 
CHAP. 
