94 
Biologjj of Ixodidae 
the main points in the life history of the tick. From his brief statements 
regarding the tick, the following data are abstracted: 
H. leachi is a three-host tick. The larvae and nymphs may drop off 
gorged from the host as early as 48 hours after being put on. The 
female remains upon the host for nine days (minimum) to 12-15 days. 
The time required for metamorphosis from egg to larva is 30-46 days 
in summer and 80-110 days in winter; the nymph emerges from the 
larval skin in 10-12 days in summer; the adult emerges from the 
nymphal skin in 18-20 days in summer and 70-105 days in winter. 
A female laid 4200 eggs. The males remain upon the host for many 
weeks, they release their hold upon the skin of the host and seek the 
females. By using an incubator he hastened the process of meta¬ 
morphosis so that he was able to raise three generations in a year. 
The tick abandons the dying host. 
The following records relate (a) to ticks received in 1902-1906 from 
Mr Lounsbury, Cape Colony, S. Africa (they were used for infection of 
dogs with Piroplasma cams), and {b) to ticks received 23. ill. 1912 from 
Mr R. E. Montgomery, Nairobi, B. E. Africa. The last named were 
the progeny (larval stage) of two replete females collected beneath a 
box in which a jackal had been kept. The first and second generations 
raised in the laboratory ai-e numbered respectively 1737 I and 1737 II. 
The time the tick remains upon the host. 
No. of 
Date when 
Host main¬ 
tained at a 
Number of 
gorged ticks 
collected on 
Host 
Larvae. 
Lot 
put on host 
temperature of 
succeeding days 
Remarks 
Hedgehog 
10 
10. X. 1905 
10 ° c. 
126 on day 4 
250 „ 5 
— 
>1 
11 
18. X. 1905 
9° C. 
104 „ 5 
6 ,, 6 
— 
12 
28. X. 1905 
9° C. 
6 „ 6 
— 
16. XI. 1906 
19 „ 4 
17 „ 5 
6 „ 6 
7 „ 7 
4 „ 8 
8 „ 9-10 
3 „ 11 
Jackal 
1737 
“I” 
24. III. 1912 
18° C. 
1 „ 3 
64 „ 4 
500 „ 5 
350 ,, 6 
36 „ 7 
