F. C. Bishopp and H. P. Wood 
163 
In April 1910, Dr R. B. Hoag sent in a large number of ticks from 
elk (Cervus canadensis) taken at Aldridge, Montana. Mr D. C. Nowlin 
forwarded us specimens collected on elk cows and calves near Jackson, 
Wyoming, on April 30, 1912. He states that ticks are very abundant 
on the elk in that locality. On May 14, 1910, Mr C. Birdseye collected 
a single female attached to the anus of one of five mule deer (Odocoileus 
hemionus ) killed near Darby, Montana. The mountain goat also acts as 
a host as shown by the fact that many adults and some nymphs (the 
nymphs were probably this species though not definitely determined) 
were taken on each of three goats killed on May 14, 1910, by 
Mr Birdseye, near Darby, Montana. 
D. albipictus has been reared experimentally from larva to adult on 
the guinea-pig and tame rabbit, as well as on the ox and horse. 
A large number of attempts to feed the tick on guinea-pigs were made 
but only in one case did any female become sufficiently engorged to 
deposit eggs. In this experiment one female became and another 
engorged when dislodged by the host, which was collared in the usual 
manner employed in our tick work. When rabbits were used many 
ticks were shaken off but some appeared to drop off normally, although 
they were smaller than the average for dropped off ticks. On a number 
of occasions many larvae of this species were placed on sheep and goats. 
A few were found attached but were dead two days later, and hundreds 
died in the greasy wool without being able to reach the skin. 
Seasonal History. 
Our records indicate that this species is to be found on hosts only 
during the late fall, winter, and early spring. The earliest record which 
we have of the occurrence of ticks on a host is October 29. This lot 
was collected by Mr L. L. Stevens at Tiller, Oregon, and contained 
1 </ (newly moulted), 17 nymphs (slightly to engorged), and two 
slightly engorged larvae. The stages present indicate that the first 
infestation had not been picked up by the hosts more than 20 days 
before. About November 10, 1912, a single female (§ engorged) 
was taken near Fort Davis, Texas (altitude 4927 feet). During the 
winter of 1911-12, Mr H. H. Hach made observations for us to 
determine the first and last occurrence of this tick. About November 15 
small lesions were observed on horses, but no ticks were found until 
December 2, when 4 and 2^ (Jq to ^ engorged) were collected. 
Ticks were found on horses throughout the winter, but during the first 
