520 ZOOIiOGY. 



1. Oestrus. Gad-Fly. Antennce three jointed, the mklJIe 

 one globular, short, deeply seated ; fig. 37, pla(e 3; 

 face broad, depressed ; mouth a simple aperture not 

 projecting ; feelers two, sunk two-jointed ; tail 

 inflected. 



This genus is exceedingly troublesome to horses, cattle, 

 and sheep, in the skins of which they deposit their eggs ; 

 which soon change into larvagj that feed under the skin of 

 living animals ; the larvae are soft, smooth, annulate, withr 

 out feetj and in most species furnished with hook-like apen- 

 dages. 



o^ 



2, Tipula. Crane-Fly. Mouth arched over, by the upper 



jaw extending from the head ; antennce filiform, short ; 

 feelers two, recurved, filiform, longer than the head ; 

 mouth furnished with a very short recurved profeo^m. 



Many species of this genus resemble Gnats, they feed on 

 various substances ; larvae without feet, soft and cylindrical ; 

 pupa cylindrical, horned ; some species reside amongst the 

 roots of aquatic vegetables, others, among grass ; but by far 

 the greater number are aquatic. The perfect flies are found 

 in abundance in the autumnal months. 



3. Diopsis. Antennce very small, setaceous ; eyes placed 



on very long foot-stalks, 



5. Mtisca. Fly. Antennce very short; palpi wanting; 

 mouth furnished with a soft i]eshy j^roboscis, with two 

 equal lateral lips. 



