04 
HORSE. 
can be killed by being trampled on, and there is also a good chance 
that the cold water (with them, as with some other moth caterpillars) 
would bring on such violent purging that they would very soon be re¬ 
duced to mere skins. 
It would at least be worth while to try some of these regular 
methods of dealing with caterpillar attack, as little appears to be 
recorded regarding preventive treatment of this special kind. 
HORSE. 
Horse Bot Fly ; Horse Bee. Gastrophilus equi , Fab. 
Gastrophilus equi. 
1, Horse Bot Fly, male; 2, curved extremity of abdomen of female ; 3, maggot; 
4, mouth hooks; 5, spiracles at extremity of tail of maggot, all greatly magnified 
after Brauer, nat. size given in descriptions. 
The history of Horse Bot Fly attack has been well known for many 
years, probably there are few insects of which the habits have been 
known correctly for so long a time, but still this knowledge is not 
nearly so widely spread as is desirable, and enquiries as to the nature 
of the attack, and amount of mischief to be feared from it, are sent me 
regularly year by year. 
I have therefore, according to desire, now given (just for use of 
those who have not the standard works on the subject at hand) a short 
description of this infestation, partly from my own observations of the 
specimens forwarded, which have given me the opportunity of seeing 
this Bot Fly (or “ Horse Bee,” as it is sometimes called) in all its 
stages, as well as the manner in which in bad cases the larvas fairly 
coat, or pavement over, the infested part of the stomach, and partly 
