9 
are thus safely transferred to distant lands, there to 
continue their species to our future disservice. 
HORSE EOT FLY. 
Horse Bot Fly. 
1, male ; 2, female ; 3, maggot; 4, chrysalis. 
If we look now at the various kinds of CEstridce , or 
Bot Flies, which are troublesome in this country, we 
find amongst them a genus named Gastrophilus from 
infesting the stomach or viscera, of which certainly three 
(and possibly more) kinds attack the horse. 
One of the most thoroughly observed of these is the 
Gastrophilus Equi, formerly the (Estrus Equi, which is 
sometimes popularly known as the “ Horse Bee,” more 
exactly as the Great Spotted Horse Bot Fly, or Knee 
Bot Fly. 
The Fly is yellowish brown, with yellowish or whitish 
hairs, a band of black hairs across the fore body, and 
blackish spots on the abdomen. The wings are opaque- 
white, with a transverse brownish or black band, and two 
spots at the tip. The female has the end of the abdo¬ 
men lengthened and curved beneath her. These Flies 
are to be found from June until October (especially on 
