63 
case trepanning would be insufficient, as they would probably be 
concealed in the convolutions of the turbinated bones. 
Perhaps the removal of the sheep to a distant pasture during 
the months of June and July, while the greatest part of the Bots 
are yet on the ground in the chrysalis state, and not bringing 
them on the pasture again till the setting in of the winter, would 
be the means of destroying them most effectually ; and if re¬ 
peated for two or three years in succession where they are parti¬ 
cularly troublesome, the farmers might eventually find their 
account in it. 
The male flies are found not unfrequently sticking to pales 
and walls about sheep pastures. 
Some large flies living in the backs of animals have of late 
years been found in America, and have been referred to this 
family ; I am, however, of opinion after more mature examina¬ 
tion, that they are not truly Oestri, but should constitute a dis¬ 
tinct genus ; their bodies are for the most part without hair 
and smooth, and their antennae plumated, in which they make 
an approach to the plumated division of the genus Musca, as 
the Musca, Ccesar, Cadaverina, Vomitoria, Mortuorum, Sfc. 
For those I have seen I have been indebted to my much- 
esteemed friend, John Francillon, whose liberality and splendid 
collection of insects need not my poor encomiums ; he received 
them from the American states of Georgia: and we are indebted 
for what we know of their habits to his ingenious correspondent, 
the indefatigable John Abbots, of the Savannah, who communi¬ 
cated drawings and the insects themselves to my friend. 
I propose to give an outline figure of three species of this 
genus, from his cabinet, with the larva and chrysalis of one of 
them ; and one new one from my own, which was purchased 
from Drury’s Cab met, being all the species I have hitherto seen. 
