26 
NORTH WIIKKW FEVER TICK AND OTHER SPECIES. 
T \ ; i i V. Long* i ity of 8t ed ticks of Margarojms annulatus Say, at Dallas. Tex., 1906. 
When dropped. 
Period from dropping 
When 
batched. 
Seed licks 
all dead. 
Maximum 
period 
from drop- 
deatb of all 
st ed ticks. 
P< riod 
of life of 
- 1 '1 
li ks. 
Minimum. 
Maximum. 
Bays. 
12 
12 
14 
12 
8 
8 
Days. 
is 
18 
21 
l't 
16 
16 
Aug. 12... 
Aug. 15. .. 
July o 
E 14. . . 
Sept. 1.... 
14... 
Oct. v 
Oct. 21.... 
Oct. 1."..... 
iio 
120 
154 
91 
Days. 

May 10 
ln7 
July 21 
D > 
49 
159+ 
•' In this experiment the seed ticks were accidentally disturbed, 
beyond the period indicated. 
- lie alive Feb. 20. 1907. 
They would have lived some days 
In the second scries of experiments to determine the longevity of 
seed ticks the eggs were placed in glass tubes with open bottom-. 
A- will be seen Prom the footnotes to Table XI certain x'al lick- in 
iiil»«- were shaded at all times, others in tubes were exposed con- 
stantly to the sun, while the remainder were placed in pill boxes 
protected from sun and rain. It is supposed that these diverse con- 
ditions give an average length of survival that approaches closely to 
that 
occurrni! 
under natural conditions. The detailed results follow 
Tabi k VI. — Longevity of seed ticks of Margaropus annulatus Say, Dallas, Tex., 1906 
Eggs deposited. 
Hatching, a 
Seed ticks dead. 
Period Period 
from fromdep- Condi- 
hatching osition tions. 
to death, to death. 
Apr. 13. 
Apr. 14. 
Anr. 15. 
Apr. 27. 
May 13. 
May 15. 
May 28. 
May 30. 
May 31. 
June 9. 
June 10 do. 
June 11 
June 21 
June 22 
June 24 
Do 
.June 30 
July l 
July 20 
Do 
July 22 
July 31 
Do 
Do 
Juno, o 
May 30 
May 31 
.June 4 
June 14 
June 12 
June 23 
June 26 
June 27 Vug. '.).. 
July 5 Sept. 26. 
Aug. 28. 
Aug. 15. 
Aug. 22. 
Aug. 28. 
Sept. 20. 
Oct. 5.. 
....do.. 
July 7 
July 18 
July 14 
July 16 
....do 
July 20 
July 22 
Aug. 10 
Aug. 11 ' Aug. 28 (escaped i. 
do 
Aug. 22 Feb. L8 
do 
Aug. 2:5 Jan. 23 
Sept. 22. 
Aug. 15. 
Aug. 28. 
Aug. 6.. 
Oct. 6.. 
Sept. 26 
do. . 
Days. 
S4 
77 
• 
85 
98 
I!.". 
L04 
L80 
Days. 
L38 
124 
130 
124 
i:a 
144 
131 
71 
110 
104 
51 
'N 
11 
L05 
B9 
88 
93 
203 
177 
CO 
('<) 
(6) 
(6) 
('') 
I'M 
(&) 
(«•) 
Co 
C-> 
I'M 
(A) 
(c) 
(••> 
(O 
(M 
C> 
.M 
{d) 
(') 
[d) 
V') 
ir details regarding oviposition of these ticks see Tables I and II. 
. ■ s. ed ticks were in open-bottom test tubes in sand in the open air. They were protected from 
the direct rays of the sun at all times by a cheese-cloth screen. Up to 11 oVlock a. m. they wen- also 
shaded by the hous. . 
cln oppn-bottom test tubes in soil exposed to sun at all times. 
'I In open paper pill boxes outdoors, protected from sun and rain at all times. 
( !onsiderable numbers of seed t icks in all lots hatching after August 
23, L906, are still alive (February 20, L907). 
