LIFE HISTORY OF CATTLE TICK. pd 
TasBLE I.—Oviposition of Margaropus annulatus, July, 1905, to July, 1906, at 
Dallas, Tex. 
= Preovipositign Oviposition aes OU OL: Number of eggs per 
S period. period. position. tick. 
fe) e = so 
1 = ; r : an ; l 
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5 is Ah sie |e Sh | Poi | Sioa iva a fe o> 
3 A E Ss |ta & | 2s s i =e 
4 = Shes = = = a |= = = 
| 
1905. Days.|Days.|Days.|Days.|Days. Days.|Days.|Days.|Days.| Eggs. | Eggs. | Eggs 
REEL Weoley St oe 2 18 2) 229 13 6] 8.2 14 8 | 11.0 | 3,806 515 1,185 
PATI NIS te ae ol < 4 5 3} 3.5 11 7} 9.0 13 11 | 11.8 | 2,228 | 1, 466 1,971 
So] 0X hom cee ea 10 4 Sul 3.4 18 12' | 15.0 20 TV at SWE (Oe le Seal gee See ee sageel ga 
Si this Wioroseeene 6 3 3] 3.0 19 19 | 19.0 21 21 | 21.0 | 3,875 | 2,365 2,576 
(O Yeh in) ee ee see 15 6 4| 5.1 44 21 | 30.7 48 21 | 32.0 | 2,311 694 | 1,795 
INOWalOmes.ccce sss 15 15 10 | 11.9 64 21 | 39.9 79 33 | 50.8 | 2,689 805 1, 891 
WCGHOE Sere: ae 14 41 21 | 28.6 70 20 | 42.6 90 55 | 71.0 | 3,946 464 1,779 
1906. 
HED: Ons= seo: ua 2 8 39 18 | 21.8 47 8 | 29.8 58 26 | 50.5 | 2,134 147 695 
Relive Zima te soe 9 40 13 | 18.7 41 30 | 38.9 53 38 | 47.8 | 3,496 10 2, 009 
1 Is eR 10 10 9 | 9.8 29; 12) 23.4 38 21 | 30.2 | 2,437 | 1,118 1,941 
PATST VOL seo ete tan. < 10 6 3) 4.8 207) Li 2168 30 20 | 25.7) 2,260 | 1,281 1, 658 
i:\ OY lp’ gee Seas 10 6 Di Onde finn LS 11 | 19.6 22 16 | 20.0 | 3,412 | 2,197 2, 891 
Miya sea c\a= 5 = 10 10 6] 7.8 17 11 | 14.6 24 18 | 21.4 | 2,676 | 1,701 2,251 
Misi 22 les Si ote Hee LO 6 4] 4.3 15 10 | 12.6 18 15 | 16.4 | 3,180 | 1,391 2,250 
mame S a. ss. 2e. 10 5 3] 3.5 13 9 | 10.9 15 12 | 13.4 | 2,881 152 1, 802 
Iota?) 0 Ee ea here) 4 3 | 3.5 14 ON ase, 16 8 | 14.2 | 2, 467 843 1,950 
PRY eke oe so xe | 10 5 Ceca) 14 9 | 11.0 16 12 | 13.9 | 2,292 | 1,135 1, 837 
ADT 5 la seer ie 10 4 Bia eae 13 7} 10.4 13 8 | 12.5 | 2,397 | 1,666 2. 068 
Gey Oph oat CRs oN a De a em rel ye See ak) PRP PRE ea 32, 499 
PATENT: ETC ee a Leeper | Denia | pp MeN WUT |e LSU | Cea SOE ENE Oe Pe hae oe aes PAu? 
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 are shiny 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 
