DIPTERA. 
the eyes occupy the greatest part of it : the larva of 
this fly dwells in frefh water : the perfect infeft is 
wont to walk upon the furface. 
It is one of the moft common two-winged infefls 
we have. The female depofits her eggs in the hollow 
flalk of aquatic plants, or broken reeds; or fo pro¬ 
vides for them that they cannot, but by fome unfore- 
feen accident, be carried away. The egg in due time 
ripening, produces a larva no way refembling the 
parent, but rather a worm of a fmgular ftru&ure. 
They may be feen crawling on the grafs and plants 
near fhallow Handing waters; or floating on the 
furface. 
The tail has a verge of hairs, which, when ex¬ 
panded, fupport it on the furface, with its head 
downward ; if it wifh to defcend, it contrails the hairs 
in the form of a wine glafs, or entirely clofes them at 
the end ; and when again it is rifing to the furface, 
it forces a bubble from a fmall aperture in the centre, 
which immediately makes a paffage for its afcenfion. 
It changes to the pupa Hate, and about the middle of 
July to the fly. It fublifts at that time on the nec¬ 
tar, and other juices, which it extra&s from the bot¬ 
tom of the corolla in dowers. 
Musca Pcndula . 
The habits nearly correfpond wuth thofe of the 
iaft defcribed. It is found in June, 
The 
