116 Biology of Txodidae 
Longevity of unfed larvae, nymphs and adults. 
Larvae. 
Progeny 
Emerged 
Number of 
days larvae 
Larvae main¬ 
tained at a 
of ¥ No. 
from egg on 
lived unfed 
temp, averaging 
Lot a 1 
12. VIII. 1911 
75 
14“ C. ^ 
2 
4. VIII. 
116 
,, 
3 
6. VIII. 
273 
12“ C. 
-5 
2. VIII. 
226 
Afterwards fed 
9 
21. VII. 
210 
11 
on host and be¬ 
haved normally. 
18 
2. IV. 1912 
210 
20 
3. IV. 
119 
14“ C. 
23 
(i. V. 
187 
12“ C. ; 
— 
1. III. 
333 (lively) 
— 
Not fed on host. 
Nymphs. 
Progeny 
of ¥ No. 
Emerged on 
Alive or dead 
after (days) 
Nymphs main¬ 
tained at a 
temp, averaging 
In a feeble state 
after 385 days 
(21. III. 13). 
Lot a 5 
12. IV. 1912 
90 (alive) 
18° C. 
Afterwards raised 
3 
18. V. 
159 „ 
16° C. 
^ to adults. They be¬ 
1 
19. I. 
167 „ 
17° C. 
haved normally. 
8 
23. I. 
175 (dead) 
17° C. 
9 
12. III. 
247 „ 
16° C. 
— 
17. VIII. 
164 (lively) 
— 
Used for raising. 
Adults. 
Progeny 
of ¥ No. 
Emerged on 
Alive after 
(days) 
Adults main¬ 
tained at temp. 
Lot a I 
31. VII. 1912 
181 (lively) 
Of room. 
II 
25. VI. 1911 
640 (some alive) 
Summary. 
Rhipicephalus appendiculatus requires three hosts upon which to 
feed in its larval, nymphal and adult stages. The larvae remain upon 
the host 3-7 days in most cases; when they remain considerably longer 
they either do not imbibe blood freely or they may not actually attach 
themselves on the day on which they were placed on the host; gorged 
larvae have dropped off the host up to 15 days after the unfed larvae 
were placed on the host. Nymphs remained upon the host 5-11 days 
and fertilized replete females abandoned the host after 6-14 days. The 
males may stay on longer. Unfertilized females may remain upon the 
host up to 24 days. The temperature at which the host is maintained, 
within the limits observed, exerts no apparent influence upon the time 
that the different stages of the tick remain attached. Metamorphosis 
