154 LIFE HISTORY OF NORTH AMERICAN TICKS. 
oviposition on the eighteenth day, the other two beginning oviposi- 
tion on the sixteenth and twentieth days after collection. The 
average preoviposition period for 13 ticks was 16.5 days and the 
average oviposition period was 19.7 days. In the laboratory in 
May, at a mean temperature of 77° F. oviposition continued for as 
long as 23 days. The largest number of eggs recorded was 4,789, 
which were deposited in the laboratory in 20 days following May 10, 
1908. The largest number of eggs deposited in 1 day was 447. 
The average number of eggs deposited, based upon records of 13 ticks, 
is 3,536. All of the females used in these counts were collected 
individuals and may not have been completely engorged. New- 
stead states that Worthly has found 7,240 eggs to be deposited 
by an individual of this species and Rohr records 7,742 from 1 
specimen. The minimum incubation period in the laboratory at a 
mean temperature of 80° F. was 37 days. Out of doors, at a mean 
temperature of 78.5° F., 54 days passed before the eggs hatched. 
Under similar out-of-doors conditions, when the mean temperature 
was 66.2° F., the incubation period was 154 days. The effective 
temperature required for embryonic development appears to be 
1,370°. Newstead reports that at an average temperature of 75° 
F. incubation was completed in from 43 to 50 days. 
Taste LXVII.—Preoviposition, incubation, and larval longevity of Amblyomma 
cajennense. 
Temperature during incu- 
Mini bation. 
era || Bemae. | Baten mum Larval 
orge Nges de- atehing | ~o ; arva 
es posited. began. wation All larvae dead. longevity. Aver- Total 
dropped. period Maxi-| Mini-| age effec 
r mum.}|mum.} daily | j. ~~ 
mean.| "Ve. 
1908. 1908. 1908. Days. 1909. Daysy | ORS | OR enn ore 
Mar-/23- 2.) Apr. 14...) June8. a5. Ga PS Seer aR nn as) aerate be 90 47 | 74.15 1,745 
Mar. 30...| Apr. 15....] June 9... 56 | Apr. 22-May 7.....| 317-332 } 90 47 | 74.36 | 1,756 
Apr. 22....) June 12... 52 | Nov. 9-16, 1908. .... 150-157 | 90 47 | 74.66 | 1,647 
Apr. 24....| June 13. - - 51 | Apr. 16—-May 7. .... 307-328 | 91.5 47 | 74.89°} 1,627 
May 8..... June 19... AS | KP atkeo=2 aia oc) erento 208-217 91.5 63 | 78.57 1, 520 
May 13... .|| June 21... 40 | June 8-16. .....-... 352-360 | 91.5 65 | 78.89 1, 486 
May 15....| June 22... 39).| Jumerg=245 22. 3.8 352-367 | 91.5 67 | 79.35 1,418 
May 20....| June 26... 38 | Before June 25... .- 364— | 91.5 68 | 80.04] 1.408 
May 22....| June 27... 37 | June 25-July 13... -- 363-381 | 91.5 68 | 80.11 | 1,373 
Aug. 26-28.| Oct. 9...-.. 45 7|AtprvlG:-- so occ 189 | 97.5 51 | 78.15 | 1,581 
1909. 1909. 1910. 
Aug. 29-30.| Oct. 21.... 54 | Feb. 10-24.......... 112-136 | 97.5 51 | 76,75 1,823 
May 18....| June 29... 43 | May 20-July 16..... 325-382 | 100 47 | 90.53 | 1,897 
The following are at outdoor temperature: 
1908. 1908. 1908. 1909. 
Apr. 22...| May 9....- Aull i oe oe 54 | June 30... 364 | 91 63 | 7 1,944 
Apr. 22...| May 9..... dulyuleee. 54 | July 4.. 368 | 91 63 | 79 1,944 
A'pr: 22. 23]) May"9-.. 2. June 30: .. 53 | June 15. 350 | 91 63 | 78.98 1,907 
Apr. 22...) May 9..... June 30... 53 | June 18. 353 | 91 63 | 78.98 | 1,907 
Apr. 22...| May 9..... June 30... 53 | Apr. 14.... 288 |} 91 63 | 78.98 | 1,907 
1909. 
Aug. 17...| Aug: 28...| Jan. 28... 1540 | Mier Ob ieee eter 57 | 99 17 | 66.23 | 3,422 
