664 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



" The day preceding the treatment a small amount of hay and 

 a moderate amount of oats is given in the morning; in the evening 

 food is withheld and a purgative given Barbadoes aloes 1 ounce, 

 or raw linseed oil 1 pint. The day of the treatment, at 6 o'clock 

 in the morning, give 3 drams of carbon disulphid in a gelatin 

 capsule; at 7 o'clock repeat the dose in the same manner; and at 

 8 o'clock give the third and last dose, making in all 9 drams of 

 carbon disulphid in three gelatin capsules. 



"The above treatment is for the adult horse. For a yearling 

 colt half the quantity of carbon disulphid used for a mature horse 

 will give the desired results. If properly administered the 

 gelatin capsule reaches the stomach intact, but soon dissolves and 

 the carbon disulphid rapidly evaporates, suffocating all bot 

 larvae and other parasites with which it comes in contact, but 

 not injuring the horse. Worms are quite often expelled as well." 



The Ox-warble * 



The Ox Warble is most prominent in the spring when it makes 

 itself apparent in the swellings or warbles on the backs of cattle. 



It is the larva of a fly somewhat 

 like the horse-bot fly but more like 

 a drone bee. 



The flies lay their eggs on the 

 legs of the animals. The newly 

 hatched larvae bore through the 

 skin and make their way to the 

 region of the neck where they 

 penetrate the muscles and tis- 

 sues until they reach the oesoph- 

 agus in the thick walls of 

 which they imbed themselves 

 and remain for several weeks. 



Fr m this locati n the y make 

 way between the muscles 



until they finally lodge just beneath the skin of the back 

 where they complete their development, cause the char- 

 acteristic swelling and finally emerge through small holes 

 * Hypod&rma lineata Villers, Family Oestridae. 



Fir, 583. The Ox Warble, female. 



From " Insect Life." their 



