G. H. F. Nutt ALL 
443 
Adults ($). 
The ticks used for these observatious began to emerge on 19. ii. 1912 
from the nymphal skin; they had therefore fasted for 64-170 days (at 
19-21° C.) before they were applied to the host. Between 23. iv. and 
7. VIII. 1912 equal numbers of ds and ?s, 5-20 pairs at a time, were 
placed upon the host (calf or ram) at stated intervals. The temperature 
at which the hosts were maintained was not recorded, the animals were 
housed in unheated stalls. 
Neither the temperature at which the host was maintained nor the 
length of time the ticks fasted appears to have exerted any appreciable 
effect upon the period of parasitism. The observations are, however, 
too few to permit of final conclusions. 
Females. 
Date when put 
No. of gorged ?s 
collected 
on successive 
Host 
on host 
days 
Calf 
23. IV. 1912 
1 on day 11 
Calf 
5. V. 
1 „ 12 
3 on day 8 
Calf 
7. V. 
7 on day 7 
Calf 
10. V. 
1 on day 4 
Calf 
12. V. 
2 „ 5 
2 on day 4 
Calf 
12. vn. 
2 „ 5 
1 6 
1 on day 7 
Ram 
24. VII. 
1 » 11 
2 on day 7 
Ram 
7. vin. 
8 „ 8 
2 „ 9 
1 „ 10 
1 on day 7 
Total 
1 „ 8 
1 „ 9 
38 $ 
Therefore 12 $s fed 8 days 
3 „ 9 „ 
3 „ 4 „ 
2 „ 11 „ 
3 „ 6, 10 and 
Males persist upon the host for 
females have dropped off gorged. 
Parasitology vn 
? s had 
previously 
starved 
for Remarks 
64 [Motas states that fer¬ 
tilized $s feed for 7-8 
76 days.] 
78 
81 
83 
144 
156 
170 
12 days respectively. 
an undetermined period after the 
29 
