LIFE HISTORY OF CATTLE TICK 
15 
T\in i: 1. Oviposition of Margaropus annulatus, July, t905, to July, 1906, at 
Dallas, Tex. 
When collected. 
Jul) 
A.ug. 3.. 
Sept. 18 
Bepl . 27 
Oct. 12. 
Nov. 6. 
Dec. 6.. 
1905. 
i.. 
Feb. 
Feb. 
Mar. 
\ P r. 
Apr. 
M.,\ 
May 
Jurii 
.in i( 
July 
July 
To+h1... 
A.ver»sp. 
\'\<-o\ [position 
period. 
B 
3 
= 
s 
3 
I 
3 
6 
15 
II 
Days, 
S§ 
Duns 
2.9 
3. ."> 
3. I 
3.0 
11. 9 
28.6 
21.8 
is.7 
9.8 
4.8 
5. 4 
7.8 
4.3 
3.5 
3.5 
3.9 
3.1 
Ovlpositl 
period. 
Days. 
i:i 
II 
is 
19 
ll 
i,i 
70 
Da us. 
6 
7 
L2 
l-.i 
21 
21 
20 
S hi 
- a 
- > 
Day 8. 
8. •_> 
9.0 
L5.0 
L9.0 
30. 7 
39. 9 
12.6 
29. S 
38.9 
23. 4 
21.8 
L5.6 
14. G 
12.6 
10.9 
11.7 
11.0 
10.4 
Period from drop- 
ping to end oi 
POSH it'll. 
Days 
1 1 
13 
20 
21 
IN 
79 
90 
Days. 
8 
n 
I I 
•21 
21 
33 
Day 8 
ll. o 
L1.8 
17.0 
21.0 
32. 
50.8 
71.0 
.Ml..", 
17. 8 
30.2 
25. 7 
20.0 
21.4 
16.4 
13.4 
14.2 
13.9 
12.5 
Numb 
tick. 
3,801 
2,228 
3,875 
2,311 
2,689 
3,946 
2, 134 
:;. 196 
2, 437 
2,260 
3, 112 
2,676 
:;. iso 
2. ssi 
2, 467 
2,292 
2,397 
5 1 5 
I. 
2,365 
694 
so:, 
164 
147 
10 
1,118 
I.2S1 
2. L97 
1,701 
1,391 
152 
843 
1,135 
i i 
Eggs. 
1 . 1 85 
1.071 
1,891 
1 , 779 
695 
2,009 
1,941 
1,658 
2,891 
2,251 
2,250 
1,802 
1,950 
1,837 
2,068 
• 199 
1,0! 1.7 
From Table I the following important, practical data are obtained: 
1. The preoviposition period ranges from about 3 days in summer 
to as many as 28 days in winter. 
2. The oviposition period ranges from between 8 and 9 days in 
summer to 42 days in winter. 
3. The total period from dropping to the end of oviposition ranges 
from 11 days in summer to 71 days in winter. 
It should be noted that Table I gives the total period from drop- 
ping to the end of oviposition based upon the weighted averages 
of the preoviposition and the oviposition periods. Therefore the 
maximum total period may be somewhat longer than indicated, as, 
for instance, in cases where either the preoviposition or the oviposi- 
tion for some reason are prolonged beyond the average. 
EGG STAGE. 
The eggs are generally elliptical, but vary in shape on account of 
pressure and drying. In color they are at first honey-yellow, but 
soon change to. a deep yellowish brown. They arc shin)' and 
smooth. The average size in a lot of 10, measured by a micrometer, 
was 0.54 by 0.42 mm. About the middle of the incubation period 
in many species a whitish spot appears on the eggs and becomes more 
conspicuous as the time for hatching approaches. This spot is 
