6'i 
VI. 
Order — DIPTERA* 
Ifftoo Win& 8 f anH ttoo -©offer* 
GENUS i.— CESTRUS GAD-FLY. 
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Jl HE CERrus has no mouth, in the place of which 
three fmall impreffed. points are found without any 
vifible probofcis or roRrum. 
The larva: of the ceRri lie hid in the bodies of cat¬ 
tle, where they are nourifhed the whole winter ; the 
perfeff infers are to be met with in the fummer 
almoft wherever horfes, cows, or fheep are grazing; 
Tome of them lay their eggs under the fkin of cows or 
oxen, which they pierce for that purpofe ; others, for 
the fame end, enter the inteftines of horfes; and 
others, again, depofit them in the noRrils of the 
fheep ; in thefe different habitations the larvae refide 
till full grown, when they let themfelves fall to the 
earth; and generally pafs the chryfalid Rate under 
cover of the firfl Rone they meet with, 
G 
From 
