176 
1911 
Oct. 25. 
Nov. 8 (14th day). 
,, 11 (17th day). 
,, 14 (20th day). 
,, 18 (24th day). 
„ 20 (26th day). 
,, 28 (29th day). 
,, 24 (80th day). 
,, 25 (31st day). 
,, 26 (32nd day). 
„ 27 (33rd day). 
Dec. 2 (38th day). 
„ 4 (40th day). 
,, 23 (59th day). 
1911 
Nov. 11 
,, 21 (10th day). 
Dec. 7 (26th day). 
,, 16 (35th day). 
,, 18 (37th day). 
,, 20 (39th day). 
,, 23 (42nd day). 
1911 
Nov. 22. 
„ 28 ( 6th day). 
Dec. 2 (10th day). 
„ 4 (12th day). 
,, 7 (15th day). 
„ 8 (16th day). 
„ 11 (19th day). 
,, 12 (20th day). 
„ 16 (24th day;. 
,, 19 (27th day). 
„ 21 (29th day). 
,, 22 (30th day). 
,, 23 (31st day). 
,, 24 (32nd day). 
1912 
Jan. 1 (40th day). 
„ 3 (42nd day). 
,, 9 (48th day). 
Mar. 8 (107th day). 
Biology of Dermacentor 
TABLE VI ( continued ). 
Infestation No. 5. On bovine. 
About 1500 larvae put on shoulders and neck of bull. 
5 nymphs recently moulted. 
Several nymphs fully engorged and quiescent. 
First nymphs moulted to adults (7 S s, 2 ? s). 
All nymphs appeared to have moulted. 
First copulation observed. 
1 engorged female dropped off. 
1 female dropped off. 
8 females dropped off or crushed. 
2 females dropped off. 
2 females dropped off. 
1 female dropped off. 
1 female. No other females found. 
6 males attached. These removed and no other ticks found. 
Infestation No. 6. On bovine. 
About 700 larvae put on calf (Jersey bull). 
1 larva fully engorged. 
1 male and 1 female recently moulted. 
1 female about engorged. To date only 2 males observed 
on host. These have now disappeared. A male from another 
host placed with above female. 
Female dropped. Another female about engorged. 
A male placed with this female. 
This female dropped off. No others found. 
Infestation No. 7. On rabbit. 
100 to 200 larvae put on rabbit. 
1 larva appears fully engorged. 
1 larva moulted. 
Collar off host; 4 larvae and 18 nymphs became detached. 
Last larva moulted. 
At least 2 nymphs fully engorged. 
Nymphs began moulting (2 s s). 
The first female appeared (3 s s and 2 $ s present). 
10 males and 5 females present. First copulation observed. 
2 females scratched off. 
First female dropped off. 
Last nymph moulted. 2 females dropped off. 
Only 1 male on host. 4 others transferred from another host. 
2 females dropped off. 
1 female dropped off. 
2 females dropped off. 
2 females dropped off. 
1 female (| engorged) scratched off. 2 others present ( T \ and 4^ 
engorged). 
1 female (-) engorged) scratched off. 
Last tick (a female engorged) scratched off by host. 
