8 



BULLETIN 45, U. S. DEPARTMENT OF AGRICULTURE. 



The following notes record the observations on sheep No. 11 : 



June 23. The sheep thoroughly examined and no ticks found. 



June 25, a m. : Four males and 11 females, collected by dragging, were put 

 on the head, neck, and shoulders of the sheep. A male and a female of the 

 foregoing were put in a fold close to the skin. The ticks put on the surface 

 were out of sight in a few minutes. 



June 25, p. m. : A dead male and a dead female were picked from the wool. 

 The male had his head near the skin but had apparently never attached. Two 

 females and one male were alive loose in the wool. The female that was placed 

 in wool next to the skin is attached. The male is not where it was placed. 



June 26, a. m. : A male and a female were picked from the head, both dead. 

 These ticks had been attached. The female that attached in the fold where it 

 was put is no longer there. No ticks are now attached. 



June 27 : Two females, collected by dragging, were put on the base of the 

 sheep's ear; also 1 female (one-fourth engorged), picked from saddle horse, 

 was put on the sheep's back. One dead unfed female was picked from the side. 

 The tick had never attached. 



June 28, p. m. : Two partly fed males were put on the head of the sheep. 

 One of the 2 females put on the ear was found dead at the base of the ear. 

 It had never attached. One female was loose on the head, crawling. The one- 

 fourth engorged female was still alive, but has not attached. 



June 29 : Two males and an unfed female found dead in wool on the head. 

 The partly fed female is now dead. 



June 30, a. m. : One dead male was picked from wool on the head. 



July 1 : One female about one-twelfth engorged was picked from a saddle 

 horse and placed in wool on the sheep's head next to the skin. 



July 2 : The partly engorged female is now dead. 



July 9 : No ticks were found after a thorough examination. 



Table IV gives a summary of the experiments with sheep Nos. 10 

 and 11. 



Table IV. — Summary of experiments with individual sheep. 



Details. 



Sheep No. 10. 



Male 



ticks. 



Female 

 ticks. 



Sheep No. 11. 



Male 

 ticks. 



Female, 

 ticks. 



Total number ticks put on sheep 



Total dead unfed ticks which never attached 



Total ticks which attached but died quickly 



Total ticks which fed some but died or were killed before attain- 

 ing any size 



Partly engorged females which died quickly when put on sheep. 



Total* dead ticks recovered 



Dead unfed ticks: 



From head 



From neck 



From back 



From side 



Total ticks known to have attached 



Total female seen with males beneath 



Total engorged females recovered 



It is a fact generally recognized that animals in confinement will 

 fight ticks more than animals running free. This fact will probably 

 account for the small number of ticks which were successful in en- 



