21 
TICKS. 
As many ticks as it was possible to obtain were collected in the Bit- 
ter Root Valley; twent 3 "-four, representing what were thought to be 
different species, were sent to the Hygienic Laboratory of the Service 
in Washington, D. C., for classification. They were referred bj^ the 
Director to Dr. Ch. Warded Stiles, Zoologist of the Laboratoiy, for 
determination, and he reports that — 
All of these specimens belong to the genus Dermacentor. There is considerable 
variation among them, but so far as I have been able to make out, this variation does 
not extend beyond the limits usually found in one and the same species in this group. 
Most of the material is not in the best condition for determination, but so far as I am 
able to discover, I can recognize as yet no specific difference between these speci- 
mens and Dermacentor reticuJatns. I would therefore make the provisional diagnosis 
of Dermacentor reticulatus. 
The ticks in box No. 1 have laid numerous eggs, and I have developed the six- 
legged stage from them. I have now made arrangements to place these young ticks 
on cattle and develop all of the various stages. With fresh material of this kind I 
shall be able to determine whether the variations noticed extend beyond the limits 
of specific value, and also whether there is any reason for ]ue to change my opinion 
that these represent the species known to zoologists as Dermacentor reticulatus. 
SYMPTOMS. 
INCUBATIOK. 
This is from three to ten days, usuall}" about seven. For a few 
da^ys the patient ma}" have chilly sensations, malaise, and nausea; 
finall}^ there is a distinct chill, and the person takes to bed. There is 
some pain in the back and head; soreness of the muscles and bones, 
causing a sensation as if the limbs were in a vise; bowels constipated; 
tongue with heav}" white coat, red edge and tip; conjunctivse con- 
gested, becoming 3 "ellowish; urine usualH small in amount, with albu- 
min and a few casts; slight bronchitis after a few da^^s; nose bleed, 
sometimes quite severe, is alwa^'s present. 
FEVER. 
Before the distinct chill there is little or no fever in the morning, 
with a slight rise in the afternoon. After the chill there is an abrupt 
rise, and from then on the fever gradually" rises in the evening, with 
a slight morning remission. The maximum is usually reached on the 
eighth to the twelfth da^^; then, in a favorable case, gradually falls, 
becoming normal about the fourteenth to the eighteenth da}-, usually 
going to subnormal for a few days. In fatal cases the fever remains 
high, from lOT^ to 105° or 106°, and the morning remissions are very 
slight or not present. 
