THE GOPHER-TORTOISE TICK. 127 
each contained only one or two larve. Three slightly engorged 
larvee collected from a rabbit on December 21, 1907, were placed upon 
a bovine on March 10; two were found attached the following day, 
while the third was found dead on March 12. While the two ticks 
remained attached for only a few days, the fact that they reattached 
shows the possession of considerable vitality. A few specimens of 
a lot of larvee from one-fourth to three-fourths engorged when col- 
lected November 30, 1908, lived for three months. . 
Engorged larve taken from a rabbit on December 21, 1907, and 
kept in the laboratory at a mean temperature of 61.4° F., did not com- 
mence to molt until 86 days later, having required a total effective 
temperature of 1,583° F. Engorged larvee collected in November 
began to molt in from 107 to 147 days. 
On the dog no particular preference as to position of attachment 
was observed, but on the rabbit the 
larvee were found in great patches 
near the base of the ears, a few 
being in and on the ears. Larve 
have been taken in abundance on 
dogs and rabbits and a few speci- 
mens on cattle and sparrowhawks. 
The nymph (Tables XLVI, 
XLVITI).—On June 8, 1909, one 
nymph was alive in a tube which 
contained 8 specimens that molted 
from larvee between March 15 and 
March 30, 1909. This individual 
had lived between 70 and 80 days 
up to the time it was put on a host Bie Rev 
(June 8). One nymph which “tended between the seutam and eapitulum 
molted March 11, 1909, was alive in position to receive an egg from the oviposi- 
Bunrapletoattach tow fost when ee 
applied on May 31, 1909, a period of 81 days after molting. Other 
lots which molted in March, 1909, and were kept on sand died in 
from 27 to 56 days. It should be stated that all of these nymphs 
were collected as larve late in the fall of 1908 and did not molt 
until March. Probably specimens dropping during warm weather 
so that they would molt to nymphs in a short time would live for a 
much longer period. 
Nymphs were found to attach readily to a bovine, but some trouble 
was experienced on account of scabs forming around the mouth- 
parts and causing the ticks to drop before becoming fully engorged. 
Specimens were found to change their point of attachment several 
times before imbibing much blood. The shortest period in which 
engorgement took place upon a bovine was 8 days, the greater 
number dropping on the ninth and tenth days, the last to leave the 
R 
