188 LIFE HISTORY OF NORTH AMERICAN TICKS. 
4,560, with an average of 8,282. The female which deposited the 
maximum number of eggs measured 17 by 12 by 6mm. ‘This female 
began depositing on the third day after dropping (September 1, 1907), 
and deposition was completed in 16 days, 1,793 eggs having been 
deposited on one day. The individual which deposited the smallest 
number of eggs was the largest tick observed by us, measuring 18 
by 3 by 8 mm. The cool weather which followed the dropping of 
this tick caused an interrupted and prolonged period of deposition 
and a considerable reduction in the total number of eggs deposited. 
Four females, engorged on a bovine, measured 14 by 10 by 7 mm., 
18 by 11.5 by 8 mm., 15 by 10.5 by 7'mm., and 18 by 12 by 7 mme 
respectively. Others were engorged on a horse and ona sheep. The 
preoviposition period varied from 3 to 9 days and the deposition 
period from 13 to 75 days. 
The minimum incubation period in May at a mean temperature of 
81° was 21 days. An effective temperature of 793° F. appears to be 
required for embryonic development. . 
TaBLE LIII.—Incubation and larval longevity of Amblyomma maculatum. 
Temperature during incubation. 
Eggs de- foun’ ee All larvee Larval 
posited. egan. we dead. , | longevity. Sees 
period. . sos Average Total 
Maximum. | Minimum. daily mean.| effective. 
1908. 1908. Days. 1908. Days. SER Sis earae as 
May 20] June 10 22 | Sept. 24 107 90 68 79.5 803. 25 
- May 21 | June 11 2 isa Omecierae 107 90 68 79.2 797. 25 
May 30 | June 19 7 Nees Ko ee 98 91.5 69 81 793. 75 
1909. 1909. 
Nov. 25 | Mar. 6 102 | June 6 92 87 17 59. 22 1,654. 00 
1909. 
Oct. 8 | Nov. 28 52) | Mar. . 1% 116 94 41 70. 05 1, 406. 50 
AT OUTDOOR TEMPERATURE. 
1906. 1906. 1907. 
Sept. Oar OC Gn|enss— "ase Feb. 18 TBO Cees ee ea ones ale oes ae eee ae 
Sept: Wien. Goer -.4| eta ee rye" Abr. 1 TOE ae See oe soe eee ke REET ee ee Pee - 
Sept., (9) |/22-G02---- 235 dane 23 110 95 42 77.4 963. 20 
1906. 
Sept. 11}: Oct.- 7 27 | Dec. 8 63 95 42 76. 68 909. 36 
1908. 1908. 1909. 
Aug. 23 | Sept. 16 24 | Mar. 3 168 100 59 83.4 969. 60 
1909. 
Oct. 3] Feb. 20 141 | June 8 108 89 10 60.98 1,201. 65 
OCH 2 2 = GOs seh 142 | June 17 117 89 10 61. 01 1,224. 25 
The larva (Tables LITI-LIV).—The longevity of larve hatched 
October 6, 1906, was 179 days, which was the maximum period ob- — 
served by us. This lot of eae was kept out of doors. 
The shortest period in which larve engorged was 3 days, over 92 
per cent of them dropping on the fourth and fifth days followmea 
attachment. 
