252 ANNULATA. 
The gnats have aquatic larve, the eggs being laid on the 
surface of the water. The Hessian Fly and the Wheat 
Midge both belong to the same genus, and both are 
destructive to crops, the larva feeding on the leaves or 
flowers. The common “ daddy-long-legs” or crane-fly has 
Fig. 172.—Tur Dappy-LONG-LEGS OR CRANE-FLY (77pzla oleracea), 
Male and also larva on the left, the female and the pupa on the right. 
a larva which feeds underground on the roots of grass. 
The bot-flies have a peculiar life-history. The common 
“horse-bot” lays its small white eggs on the hair of the 
horse. The larva is found in the stomach of the horse 
and may give rise to serious inflammation. Other ‘‘ bots” 
live in the nasal cavity of the sheep or under the skin of 
A, Egg on a horse-hair ; C and B, larve; D, pupa case; and E, the fly. 
