(•)() 
NORTH A.MEBICAN FEVER TICK AND OTHER SPECIES. 
Tabi i. XVI. Incubation and longevity of Ambiyomma americanum. 
Com- 
menced 
to hatch. 
Apr. 15 17 June 3 
Apr. 25 , .June .". 
Apr. 28 June 8 
May28and29 July 1 
May 30 and 31 July 1 
Minimum 
incul Its all 
t ion 
period. 
Period of- 
i iiih..-;ui /-\„: : 
dead °VP° SX - Hate 
to death. 
tching 
to death. 
Days. 
: pt. 13. 

42 
35 \ 
33 Nov. 22. 
Days. 
152 
Days. 
103 
163 
177 
129+ 
145 
a One or more alive. 
From the above table it will be seen that the incubation period in 
April and May is about 7 weeks. Eggs deposited in the latter part 
of May hatched in 5 weeks. 
Prof. H. A. Morgan has found some specimens to pass the first 
molt on the host, drop- 
ping in about 10 days fol- 
lowing that molt, or just 
previous to the second 
molt. The greater num- 
ber dropped in from 4 to 7 
days. The molting of 
the nymph was found to 
last 6 weeks. Engorge- 
ment of the adult in March 
and April occupied from 
7 to 11 day-. 
The resistance of the fe- 
male to water seems to be 
similar to that of the fever 
tick. Seven females were 
submerged for 18 hours, 
all becoming active fol- 
lowing removal from the 
water. The next day all 
Only one, an unengorged 
Fig. 9 
Ambiyomma cajennense: Mouth parts of 
Greatly enlarged (original). 
Dale. 
were again submerged for 45 hours 
specimen, survived. 
In the adult stage both sexes will reattach, as seems probable in the 
larval and nymphal stages. 
Mr. Mitchell has observed adults on grass in the act of copulation. 
CAYENNE TICK. 
i . Imblyomma cajt ////< ns( I : 
Synonyms: /. crenatum Say (Banks), .1. mivtum Koch (Banks), J.Jun; i Dug&s 
i. ilptns Berlese I Neum. . 
This species was described from Cayenne in 17^4, no host being 
