42 



eggs being deposited there by the female fly soon after it leaves 

 the cow. 



Two hymenopterous parasites are known to attack it on these 

 islands. 



\ arious spraying solutions have been tried to render the in- 

 fested cattle immune to attack, but the relief obtained even when 

 an application is possible is of a very temporary nature. 



Apparently from various reported experiments one of the most 

 effective compositions consists of train-oil with a small percentage 

 of sulphur or carbolic acid added, this rendering an inimunity 

 of five to six days. Fish-oil, coal-tar and kerosene emulsion arc 

 also recommended.^ 



An ingenious fly-trap has been tried, with apparently satis- 

 factory results. It is described as follows: "The device is de- 

 scribed as a structure 6 feet high and 4 feet wide, fitting closely 

 in a stable door. On the outer side is hung a curtain, while the 

 inner side, next to the door-way, is composed of broom corn ex- 

 tending from the top downward and from each side toward the 

 center, so that the cow in going through is brushed over every 

 part of the body, while the elastic broom corn, springing back 

 into place, prevents the flies from following her into the stable. 

 The roof of the structure is of wire netting, in which is a trap 

 which the flies can enter but cannot leave. In use the cow is 

 driven into the pen, the curtain let down behind her, and as she 

 passes into the stable the broom-corn brush sweeps off the flies, 

 which by a shake of the curtain are sent up into the trap. The 

 editor of the Canadian Live Stock Journal, according to the press 

 account, saw twenty-eight cows put through this contrivance in 

 twenty-eight minutes, including the placing of the device at three 

 barn doors. "*^ The application of this or a similar type of trap 

 seems quite practical, where the stock are housed daily, but I am 

 not aware of the attempt having been made on these islands. 



Family Ocstridae (Bot and Warble flies). 



These flies are serious pests to stock. The larvae live within 

 the digestive tract and frontal sinus, or enter beneath the skin 

 causing large sores and often rendering the hides practically 

 valueless. 



^Insect Life, Vol. II, pp. 102-103. 

 * Insect Life, Vol. VII, pp. 425-426. 



