21 
TICKS. 
As man}" ticks as it was possible to obtain were collected in the Bit- 
ter Root Valley; twenty-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 W"ere referred by the 
Director to Dr. Ch. Warded Stiles, Zoologist of the Laboratory, for 
determination, and he reports that^ — 
All of these specimens belong to the genus Dermacentor. There is considerable 
variation among them, hut so far as I have been able to make out, this variation does 
not extend beyond the limits nsually 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 reticulatus. 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 me to change my opinion 
that these represent the species known to zoologists as Dermacentor reticulatus. 
SYMPTOMS. 
IXCUBATIOX. 
This is from three to ten days, usually about seven. For a few 
days the patient may have chilly sensations, malaise, and nausea; 
finally 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 heavy white coat, red edge and tip; conjunctivee con- 
gested, becoming yellowish: urine usually small in amount, with albu- 
min and a few casts; slight bronchitis after a few days; nose bleed, 
sometimes quite severe, is always present. 
FEVEK. 
Before the distinct chill the" ^ 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 day; then, in a favorable case, gradually falls, 
becoming normal about the fourteenth to the eighteenth day, usually 
going to subnormal for a few days. In fatal cases the fever remains 
high, from 10T° to 105° or 106°, and the morning remissions are very 
slight or not present. 
