210 BOT-FLIES. . 
in the soil, and in the winged or adult form they fly about in 
search of quadrupeds upon which to deposit their eggs. In 
this winged state the flies are very active only during the 
warmer portion of the day and delight to bask in the sun, 
sitting upon some elevated rock or dead tree. Many species 
of Bot- or Gad-flies are known, each living,as a general rule, 
in its larval state in some particular animal, and usually 
even in a certain organ of that host. Man is not exempt, 
and in tropical America tumors caused by one or more spe- 
cies of such parasites are not uncommon. Even in more 
temperate regions such larvee are found from time to time 
under the skin ofman. Fig. 174 showsalarva of the Bot-fly 
of man(Dermatobianoxialis Goudot) 
taken from man. Dr. John Hamil- 
ton describes in the Entomological 
News a case that came under his 
observation. He writes: 
“Several years ago I saw, pro- 
fessionally, a boy six years of age 
who had been suffering for some 
months from the glands on one 
side of his neck being swollen and a 
fetid ulceration around the back 
teeth of the lower jaw of the same 
List fa Bettie Cre eel: Three months treatment 
Tplaterd:sentter (Biever, was of no avail, and the end 
seemed near; onedaya white object which was seen to move, 
was observed in the ulcer at the root of the tongue, which 
on being carefully extracted proved to be a large grub, 
which, from having frequently seen them, I recognized as a 
full-grown larva of Hypoderma. It was of the usual tawny 
color, about half an inch long when contracted, about one- 
third that thickness, and quite lively. The caseended fatally. 
This boy had been on a farm in Illinois the previous fall, 
where probably the egg was in some way taken into his 
mouth, and the larva found between the base of the tongue 
and the jaw suitable tissue in which to develop, coming to 
maturity at the same time with those bred in cattle: 

Bot-flies are stout and hairy insects, usually resembling 
