‘ 
26 NORTH AMERICAN FEVER TICK AND OTHER SPECIES. 
Taste V.—Longevity of seed ticks of Margaropus annulatus Say, at Dallas, Tex., 1906. 
Period from dropping Maximum 
to completion of ovi- period Period 
When dropped. position. When _ | Seed ticks | from drop-| of life of 
hatched. | all dead. ping to seed 
; ant is death ofall] ticks. 
Minimum. | Maximum. SeadniGia 
1 4 
Days. Days. ‘ Days. Days. 
VINE ZO Pea ae wich geen 12 185) Aue. 122 32! OCtSiecce 110 57 
PUINION2S | = Reena ines meee tel oe 12 18°) Auge 15-7. 2) Oet. 215225 120 a67 
14 Beta allt epee ae eee ie eee 14 PA) wba ase Oct. 205252 154 107 
Mithloygelteye 3 ee oh ae rae eee 12 19 Avie e142 OCt. pose. = 86 62 
DOME ete On Ge Se ace heck 8 16% Sept-wi-c--| Ochw2os-- 2 91 49 
UNirec au hk see ee ener ORL An Mba 8 16 | Sept. 14... (b) 175+ 159+ 
v 
aIn this experiment the seed ticks were accidentally disturbed. They would have lived some days 
Py gome alive Feb. 20, 1007. | 
In the second series of experiments to determine the longevity of 
seed ticks the eggs were placed in glass tubes with open bottoms. 
As will be seen from the footnotes to Table VI certain seed ticks in 
tubes 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 occurring under natural conditions. The detailed results follow: 
Taste VI.—Longevity of seed ticks of Margaropus annulatus Say, Dallas, Tex., 1906. 
| Period | Period | 
Eggs deposited. Hatching. @ Seed ticks dead. Peas Renee Cones 
: to death.| to death. 
a Ses oe h 
Days. Days. | 
AME QBs ners ae Ne sce 84 138 (b) 
Ao R LOUIS, © eens Tif 124 (b) 
UN (Se en ak 83 | 130 (0) 
AMIE HAS eee eee 85 | 124 (0) 
Sen tc hi oy see peer 98 131 (>) 
Chae ae ce 115 144 (b) 
sna Coss et Masser 104 131 (0) 
Lat pact Ma, TOR eee OBES ee Roa essa ly seec ast bl) 
ATE OE eed Dee Bais oe 43 71 (b) 
Vests) Oi Fast? Opes ert ce meager 83 110 | (b) 
() 
(b) 
(0) 
(¢) 
(b) 
(e) 
(3) 
(b) 
(¢) 
(b) 
(d) 
(¢) 
(d) 
aS eoo)s eee eee etna () 
a For details regarding oviposition of these ticks see Tables I and II. 
b The seed 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 o’clock a. m. they were also 
shaded by the house. 
c¢In open-bottom test tubes in soil exposed to sun at all times. 
dIn open paper pill boxes outdoors, protected from sun and rain at all times. 
Considerable numbers of seed ticks in all lots hatching after August 
23, 1906, are still alive (February 20, 1907). . 
