106 
Biolofjy of Ixodidae 
collected froui sheep at Hammam-Meskoutine, Algeria, and sent to 
me 11. VI. 1911 by M. Paul Dechabert. These females oviposited after 
their arrival in Cambridge; one of them began to lay eggs 46 days after 
she had been taken from the host. My observations start with the 
larvae which were placed upon a host on 3-9. X. 1911, namely 32-38 
days after they had hatched. Some incomplete records of earlier 
experiments are included in the protocols which follow; they relate to 
ticks (Lot X) which were collected from cattle in the vicinity of Rome 
and kindly sent to me 6. v. 1906 by Prof. Gosio from Italy. 
Time the tick remains upon the host. 
Larvae which dropped off the host as gorged larvae. 
Host 
Earn 
Host main- 
No. ofLot Date when tained at 
13U5a put on host a temp, of 
15 13. XI. 1912 4-.5°C. 
Xo. of gorged 
larvae collected 
on successive days 
Remarks 
13 on day 8 
Progeny of four females 
20 
„ 9 
received from Algeria. 
16 
,, 10 
10 
„ 11 
1 
„ 12 
1 
„ 13 
. 1 
„ 14 
62 
Hedgehog 
5 29. VIII. 1912 
16‘5°C. 3 on day 6 
5 „ 7 
1 „ 8 
8 „ 9 
17 
Ditto. 
Hedgehog 13 16. x. 1912 
14° C. 6 
45 
152 
8 
4 
149 
247 
117 
82 
810 
28 
day 7 Ditto. 
, 8 
, 9 
, 10 
, 11 
, 12 
, 13 
, 11 
, 15 
day 9 
Guinea-pig 
Y 
12. VIII. 1912 
17-5° C. 
Ditto. 
