FISH-CULTURAL INVESTIGATIONS IN MONTANA AND WYOMING. 
47 
11. Coregonus williamsoni Girard. (Pl. xxi.) 
The collection contains specimens of whitefish from the following localities : 
a. Swan River below Swan Lake, Montana 21 
b. Jocko River, Ravalli, Montana 6 
c. Big Blackfoot River, Bonner, Montana 3 
d. Little Blackfoot River, Elliston, Montana 12 
e. Cottonwood Creek, Deer Lodge, Montana 1 
/. Snake River, President Camp, Wyoming 19 
g. Red Rock River, Red Rock, Montana 7 
h. Beaverhead River, Dillon, Montana 5 
i. Junction of Firekole and Gibbon rivers 2 
In addition to the material collected by us, I have examined numerous other speci- 
mens from the Upper Missouri Basin, comparing them with a large number from the 
upper tributaries of the Columbia, but I am unable to find any difference of value. 
The Columbia specimens are perhaps somewhat deeper. Examples from Bed Bock and 
Beaverhead rivers have the head 4£ (4 to 4§) ; depth, 4| to 44; scales, 80 to 84. Those 
from Little Blackfoot and Swan rivers have the head 44 to 44 ; depth, 4 to 4^; scales, 80 
to 84. 
Small specimens, 3 to 5 inches long, show the following color markings: Silvery 
over entire surface below the lateral line, with a few scattered dark punctulations and 
a little black on lower caudal rays, plainest toward the base; bluish above lateral line, 
with numerous larger and darker punctulations; under these are seen the vanishing 
bluish blotches so evident in younger examples. Dorsal and adipose fins, as well as 
snout and top of head, covered with very fine dark spots. Younger specimens, a 
little under 3 inches in length, have the steel-blue blotches very distinct, there being 
about 10 of them, most of which just touch the lateral line from above; above these 
are about 20 similar blotches of various sizes — mostly smaller, however, than those 
along the lateral line. 
A still smaller specimen (2£ inches) in life was silvery below, 8 or 9 dark-bluish 
spots along side, mostly above lateral line; back darker, with numerous spots; top of 
head with very fine spots. 
The fact that the young whitefish has the parr markings is a very interesting one, 
and is of value in showing its relations to the trout. (See PI. xxi.) 
12. Thymallus slgnifer (Richardson). (PI. xxii.) 
We found the grayling in Bed Bock Biver, Beaverhead Biver, and in the Gibbon 
at its junction with the Firehole Biver; and also in the stream formed by Horsethief 
Springs — all tributary to the Tapper Missouri. 
Two examples, 10 and 11 inches long respectively, from the junction of the Fire- 
hole and the Gibbon, show some differences in measurements; the larger has the head 
4f; depth, 4; eye, 4£; scales, 8-97-10, and dorsal 19; the other, head, 4f; depth, 34; 
eye, 44; scales, 8-91-10, and dorsal 19. Length of dorsal fin a little greater than head, 
height about 1 4 in head, but much less than depth of body ; origin of dorsal one-third 
length of body from snout. About 18 inky black spots and about 6 fainter ones on 
side of body. The number of these spots is of little value, however, as the smaller of 
these two specimens has 25 distinct spots on one side and but 18 on the other; nearly 
all the spots are anterior to the dorsal fin. 
