42 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
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caudal ; scales very small and crowded anteriorly, about 93 in lateral line. D. 10, its 
height 1 J in head, a little greater than length of its base; anal long, nearly equal to 
head; pectoral shorter, 1| in head. 
2. Catostomus catostomus (Forster). 
Cyprinus catostomus Forster, Phil. Trans., 1773, 155. 
The collection contains the following specimens, which I refer to this species : 
a. Little Blackfoot River, Elliston, Montana 16 
b. Browns Gulch Creek, Silver Bow, Montana 47 
c. Lolo Creek, near Missoula, Montana 22 
d. Jocko River, Ravalli, Montana 5 
All are young specimens, none being over 8 inches in length. Head, 4-} to 4|; 
depth, 5 to 54 ; eye, 5 to G; snout, 24 to 24 . 
There is a little variation in the papillae, but there are never over four rows on the 
upper lip ; in fact two to three rows is the almost constant number. Compared with 
specimens of C. griseus from the South Platte, at Denver, Colorado, the Montana 
specimens have the lips much smaller, the rows of papillae fewer, and the jaws with 
much less distinct 'cartilaginous cutting edge. 
I have also compared them with specimens of Catostomus catostomus from various 
places, and others labeled (J. longirostris , and am not able to see any important differ- 
ences. The type of C. retropinnis Jordan has very much larger lips than in any other 
specimens I have examined, and the scales are smaller. It is perhaps best to retain it 
as a distinct species for the present at least. 
3. Catostomus macrochilus Girard. (PI. xvm.) 
Catostomus macrochilus Girard, Proc. Acad. Nat. Sci. Pkila. 1856, 175. 
This large sucker is very common in Post Creek, on Flathead Indian Reservation, 
and in Swan Lake. It is no doubt common in Flathead Lake and the streams of that 
region, but we obtained specimens only from Post Creek and Swan Lake, three from 
the former and seven small ones from the latter. Examples 16 inches long have the 
head 4, depth 5, and eye 6. Scales, 11 or 12-72 to 75-10 or 11, about 40 before dorsal. 
Dorsal long, of 14 or 15 rays; pectorals and anal long, the latter nearly equal to head; 
papillae not very large. 
4. Catostomus ardens Jordan & Gilbert. (PI. xvm.) 
Catostomus ardens Jordan & Gilbert, Proc. U. S. Nat. Mus., 1880, 464. (Utah Lake.) 
We found this sucker very abundant in the Snake River at President Camp, 
where numerous specimens were taken, from very small ones up to a foot in length. 
Very much larger individuals, presumably of this species, were seen in water too deep 
to seine. Specimens 7 to 12 inches long have the head 4 to 4^, depth 44 to 5, eye 5£ 
to 6, and the snout 2j- to 24. Scales, 10-63-9, much crowded in front; origin of dorsal 
fin very slightly nearer snout than base of caudal. Papillae on upper lip in about five 
rows, not evidently so many in younger specimens. 
5. Rhinichthys dulcis (Girard). (PI. xix.) 
Argyreus dulcis Girard, Proc. Acad. Nat. Sci. Pkila. 1856, 185; P. R. R. Survey, x, 243, pi. liv, 
kgs. 5-8, 1858. 
Rhinichthys dulcis, Jordau, Bull. U. S. Fisk Com.,ix, for 1889, 1891, 48. 
This little minnow is pretty generally distributed throughout the region visited 
by us, numerous specimens being obtained at each of the following places : 
