PARASITOLOGY. 27 



body heavy, and covered with soft, yellowish hair. 

 The eyes are small. The female is provided with a long 

 ovipositor. The posterior of the male is rounded. 



Life 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 ^^z is to be deposited, then darts down, 

 cements it to the hair in an instant, retreats a few 

 feet, hovers again, then deposits another ^ZZ- The 

 cap or operculum is pushed off the large end, through 

 which the young grub escapes 

 when the ^^^ is hatched. 

 The eggs hatch in three 

 weeks. The animal, by lick- 

 ing, gets the larva into its 

 mouth ; the larva finds its way 

 to the stomach, attaches it- 

 self to the pyloric portion 

 by means of two booklets 



(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. 



Ajiimal Attacked. — The horse. 



Part Infested. — 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) . 



Syno7iyms. — Oestrus hemorrhoidalis; red-tailed 

 bot-fly; bot-fly of horse. 



Fig. 4— Gastrophilus 

 Larva. 



a, Dorsal View. 



b, Ventral View. 



Equi 



