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- 
bation. 
Date en- Mini te 
gorged Eggs de- | Hatching a ren Larval 
Sita posited. began. batign All larve dead. longevity. ese Total 
opped. period ° Maxi-| Mini-}] age afta 
mum. |mum.| daily tive 
mean j 
1908. 1908. 1908. Days. 1909. Days. Sy de 10 wpe oo, 
Mar 25-2 |e pr4 ool sme sc. BO cacsapae ek ole es a ge ae Ak 90 47 | 74.15 | 1,745 
Mary 30522|) Acpr. W522.) June Oe ek 56 | Apr. 22-May 7..... 317-332 | 90 47 | 74.36} 1,756 
Apr. 2222-2), sumedi2. = 52 | Nov. 9-16,1908..... 150-157 | 90 47 | 74.66} 1,647 
Apr: 24....=| Jume13).. - 51 | Apr. 16-May 7 91.5 47 | 74.89 | 1,627 
May 8....- June 19... 43 | Jan. 13-22 91.5 63 | 78.57 | 1,520 
May 13....} June 21.. 40 | June 8-16 91.5 65 | 78.89 | 1,436 
May 15....| June 22... 39 | June 9-24 91.5 67 | 79.35 | 1,418 
May 20....| Jume 26... 38 | Before June 25 91.5 68 | 80.04 | 1.408 
May 22....| Jume 27... 37 | June 25-July 13 91.5 68 | 80.11 | 1,373 
Aug. 26-28.| Oct. 9..... ABM AGE UOh ss seuss oiels 189 | 97.5 51 | 78.15} 1,581 
1909. 1909. 1910. 
Aug. 29-30.| Oct. 21...- 54, || MebylO—2422 522 ee 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..--- Jiilyal aes aa sne SO ses yao eee 364 |} 91 63 | 79 1,944 
IAT 22). | ea Oo22 oe July 152-2. Daath ys 4 eee 368 | 91 63 | 7 1,944 
ADS 22-2 |e Mayigia =: June 30... 53 une do. see Bee eean 350 | 91 63 | 78.98 | 1,907 
Apr. 22...| May 9..... June 30... beh a iplne dis oodase aes Se Spill Wil 63 | 78.98 | 1,907 
Aspr.22.2.|) May 9.2522 June 30... FJ [aes 0) ail: ane a enya 288 | 91 63 | 78.98 | 1,907 
1909. 
Aug. 17...| Aug. 28...| Jan. 28..-.. PSA Mar 126 eee 57 | 99 17 | 66.23 | 3,422 
eee ee ee ee eee 
