FISH-CULTURAL INVESTIGATIONS IN MONTANA AND WYOMING. 
43 
No. of 
specimens. 
a. Beaverhead River, Dillon, Montana 115 
h. Red Rock River, near Red Rock, Montana 5 
c. Junction of Firehole and Gibbon Rivers 23 
d. Snake River at President Camp, Wyoming 6 
e. Browns Gulch Creek, at Silver Bow, Montana 3 
/. Big Blackfoot River, near Bonner, Montana 4 
g. Little Blackfoot River, Elliston, Montana 6 
Those from Beaverhead River are the largest specimens seen, many being 3,] to 4 
inches in length. It was also more abundant here apparently than elsewhere. The 
specimens from the junction of the Firehole and Gibbon are all very small. In many 
examples measured, the origin of the dorsal is a little nearer the nostril than base of 
caudal tin, but midway between base of caudal tin and tip of snout. 
6. Mylocheilus caurinus (Rich.) Girard. (PL xix.) 
Cyprinus ( Leuciscus) caurinus, Richardson, Fauna Bor. Am., in, 304, 1836. 
Mylocheilus caurinus, Girard, Proc. Acad. Nat. Sci. Pliila. 1856, 169. 
Common in Flathead Lake and in Bitter Root River. Curiously enough, at Flat- 
head Lake it is called “white fish” and is served at the hotels as such, while the true 
whitefish, which is not uncommon in the lake, does not appear to have attracted the 
attention of the local fishermen. About a dozen specimens were examined, ranging 
from 8 to 11 inches in length. 
Head, 4 to 4f ; depth, If to 4|; eye, 4| to 5; snout, 3f to 3§; pectorals, If to 1§ in 
head; ventrals, If; dorsal, 8, a little longer than pectorals, about If in head; anal, 8, 
equal to ventrals. 
Scales, 12-77-7; teeth, 1, 5-5, 1 in numerous examples studied; in fact, 1 do not 
find a single case in which there are two teeth in the lesser row. 
Color in life, dark greenish above, extending down nearly to the lateral line, where 
there is a dark irregular band two scales wide. Below this is a reddish band two or 
three scales wide, extending the full length of the fish, while the dark band stops at 
the posterior edge of dorsal fin ; below, white ; top of head, greenish ; cheeks and opercles 
paler, with fine punctulations of dark; corners of mouth with a reddish wash extending 
backward on cheeks; a little orange on opercles and at base of pectorals. 
7. Ptychocheilus oregonensis (Rich.). (PI. xix.) 
This voracious fish is very common in Flathead Lake, where it is currently known 
as “squawfish.” We also found it common in Lolo Creek and in Bitter Root River, 
near Missoula. 
Numerous individuals from 7 to 12 inches long were examined. Head, 3|; depth, 
44; eye, 6; snout, 3; scales, 19-80-7 ; teeth, 2, 5-4, 1. Tip of snout to angle of mouth, 
2| in head. Dorsal, 10; anal, 8; the pectorals equal the anal but exceed the ventrals; 
the height of the dorsal fin is contained If times in the head, and is 7 j greater than 
its length. 
Color in life, above nearly uniform muddy greenish, a few scattered scales showing 
silvery; growing gradually silvery on the sides, with a slight tinge of orange, and 
slightly dusted with dark, this extending about four scales below the lateral line; 
under parts white, pale greenish on caudal peduncle; cheeks silvery, with a few dark 
