PARASITOLOGY. 27 
body heavy, and covered with soft, yellowish hair. 
Theeyes aresmall. The female is provided with along 
ovipositor. The posterior of the male is rounded. 
Lite Cycle.—The eggs are oval in shape, light yel- 
low in color, and are cemented to the hair of the 
animal attacked, principally in the region of the jaws 
and fore limbs. The fly hovers over the region on 
which the egg is to be deposited, then darts down, 
cements it to the hair in an instant, retreats a few 
feet, hovers again, then deposits another egg. The 
cap or operculum is pushed off the large end, through 
which the young grub escapes 
when the egg is _ hatched. Fm 
The eggs hatch in three Be rm 
weeks. The animal, by lick- pene 
ing, gets the larva into its a 
mouth; the larva finds its way 
: . Fig. 4—GASTROPHILUS EQui 
to the stomach, attaches it- Larva, 
self to the pyloric portion { a 
by means of two hooklets 
(small hooks) and remains there ten months. Upon 
reaching the fully developed larval state it loosens 
its hold, passes out to the ground with the feces, 
burrows into the ground one inch and there passes 
through the pupal stage, which lasts from four to 
six weeks. 
Animal Attacked.—The horse. 
Part Intested.—The stomach. 
Injury to Host.—Seldom if ever any injury. 
Treatment—Two drams bisulphide of carbon given 
in capsule followed by a physic. 
GASTROPHILUS HEMORRHOIDALIS (Gaster—stomach) 
(Phileo—to love). 
Synonyms.—Oestrus hemorrhoidalis; red-tailed 
bot-fly; bot-fly of horse. 
