92 
Biologi! of, Ixodidae 
Time required for metamorphosis. 
Epg to Larva: reckoned from the beginning of oviposition to the date when the first 
larvae issued from batches of eggs laid by isolated females : 
Lot 1308 
from Ireland 
Progeny of ? No. 
Eggs laid on 
Larvae 
emerged after 
Mother-tick and eggs 
maintained at a 
temperature of 
1 
13. V. 1911 
-53 days 
20° C. 
2 
14. 
•56 
3 
18. .. 
52 
4 
18. „ 
54 
• » 
.7 
18. ,, 
54 
? ? 
0 
19. „ 
51 
7 
18. ,, 
54 
8 
18. ,. 
49 
9 
18. ,. 
52 
• ? 
10 
18. „ 
54 
J > 
11 
18. „ 
54 
J 1 
12 
18. ,. 
62 
» • 
13 
95. ,. 
51 
1 » 
417 1 2 received 
13. VI. 1908 
58 
23. V. 1908 
from Scotland 
Note :—Two to three days after the larvae emerged their hard chitinized parts appeared 
dark, and they had scattered themselves away from the exuviae, sometimes four da 5 's 
to a week elapsed before all the larvae had issued, reckoned from the first emergences 
in the one batch of eggs. 
Larva to Nymjih. Lot 1308. Gorged larvae dropped from a calf on 7. x. 1911. They 
were maintained at 10° C. during metamorphosis and emerged on 8. ii. 1912, the 
period which elapsed being 124 days. 
Observations relating to oviposition. 
Recording (a) the time that elapses before the gorged and fecun¬ 
dated female begins to oviposit after removal from the host; (6) the 
time occupied in oviposition ; (c) the time which the female may 
survive after oviposition has been completed; {d) the number of eggs 
laid by single females. 
The following record relates to ticks received from Mr H. W. Percy, 
28. IV. and 3. v. 1911, having been collected, immediately before they 
were sent, from cattle suffering from redwater (Piroplasmosis) in the 
vicinity of Athlone, Co. (lalway, Ireland. 
