134 LIFE HISTORY OF NORTH AMERICAN TICKS. 
TaBLE LIT.—Engorgement of nymphs of Amblyomma dissimile. 
Nymphs dropped engorged—days following application. Total 
Date be SR SB AR SAS ES ke A A Ae Ne a a eR ETE 
myepes Host. ber 
applied. 9 drop- 
5 6 7 8 9 iil 12 13 14 ped. 
1908. 
Aug. 1] Bovine.... if 6 il 2 0 0 0 0 0 10 
Aug. 8 | Tortoise... 0 0 0 0 0 1 1 4 2 8 
The molting of 28 individuals was observed. In August, at a 
mean temperature of 83° F., molting commenced in 12 days, the 
ereatest number molting from the fifteenth to seventeenth days. An 
effective temperature of at least 479° F. appears to be required. 
There is no marked difference in the periods required for the molting 
of nymphs engorged on warm-blooded and on cold-blooded. hosts. 
The adults—Seventy-one per cent of the 28 individuals which 
molted to adults were females. On June 2, 1908, 4 males and 5 
females which were slightly engorged were collected on an iguana. 
The last female of this lot died between July 18 and August, 1908, 
while one of the males lived until October 9, 1908, a period of 129 
days. In a lot consisting of 1 male and 2 females which molted Sep- 
tember 5, 1908, the male showed the greatest longevity, living 103 
days, although it was very weak for over a month prior to its death. 
A female which molted September 13, 1908, lived about three months 
in a pill box under very unfavorable conditions. 
Numerous attempts were made to get males and females to attach 
to a bovine, but all failed, and it is probable that as adults they never 
attach to warm-blooded hosts. On July 2, 5 females and 1 male 
were placed upon a box tortoise and all readily attached. On the 
second day following, 2 females had detached and were missing, appar- 
ently having been eaten by the tortoise, and on the following day a 
third female was also missing. The male and remaining female which 
were attached at the anterior part of the body of the tortoise remained 
attached until July 26, when the male was found to have reattached 
at the anterior part of the host’s body. On July 27 the female com- 
menced engorging and the following day the male was missing. On 
July 30, 28 days after attachment, the female had become fully en- 
gorged and was removed in order that it might not be injured or lost 
in dropping. This tick measured 14 by 9by 5mm. During attach- 
ment no signs of mating were observed; however, as eggs deposited 
by the female hatched, it is probable that the tick was fertilized just 
prior to the date that it commenced to increase noticeably in size. 
It thus appears that mating continues for only a very short time. 
. ‘The position at which the female attached and engorged was just 
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