48 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
eased. These and otlier worms takeu by us iu fishes of the Park are the subject of a 
special report by Prof. Edwin Linton. 
3 . Rhinichthys dulcis (Girard.) (Plate VII, Fig. 3.) 
This species is common iu nearly all cold clear streams in the Rocky Mountains. 
It is rather abundant iu the Gardiner River below the falls, and it might probably be 
introduced to advantage iu the rivers above the falls as food for trout. Our specimens 
agree with all others examined by us from both slopes of the Rocky Mountains in hav- 
ing the barbel very small and the insertion of the dorsal a little farther back than in 
the Eastern species, Rhinichthys cataractm, midway between nostril and base of caudal. 
In R. cataracUc the insertion of the dorsal is about midway between tip of snout and 
base of caudal. The western form may stand as didcis { = Argyreus dtdcis 
Girard— Rhinichthys maxillostts Rhmichthys transmontanus Go\)Q=Rhinichthys 
luteus Garnran — Rhinichthys ocella Garman.) 
Rhinichthys dulcis is an active little minnow, abounding about cascades and iu swift 
brooks. It reaches a length of about 5 inches. 
4 . Agosia uubila (Girard). (Plate VII, Fig. 4.) 
A little fish inhabiting brooks and swift waters, agreeing very closely in appear- 
ance and habits with Rhinichthys dulcis. It is as abundant iu the Columbia basin as 
the other is on the eastern side. It extends its range southward to Utah, and perhaps 
beyond. We found this species rather common iu the warm waters of Witch Creek. 
Scales 03 to 65 ; lateral line complete. 
5 . Leuciscus atrarius Girard, (Plate VIII, Fig. 5.) 
I identify with Girard’s Sibonia atraria a chub which is abundant in Heart Lake 
and which ascends its warm tributary — Witch Creek — in great numbers, going uj) 
farther thau any other fish (temperature 88°). It reaches a leugth of about 7 inches.* 
Cheonda coirtdea, known from a single specimen from Lost River, Oregon, may be the 
same also. The Witch Creek fish is less slender thau Girard’s type, but the prob- 
abilities are that the two are identical. • 
The Witch Creek fish seems to belong to the same species as the common chub 
of Utah [Leuciscus atrarius). It is a rather slenderer fish than the latter, with heavier 
head, lower back, and more slender tail; scales a little smaller, 11-56-6; 28 to 30 
before dorsal (23 to 28 in atrarius). In form of mouth, eye, fins, and coloration 
there is no evident difference. Color dusky olive; the scales everywhere with dark 
points. Head 4 in leugth; depth 3f ; teeth 2, 5, 4, 2, with rather broad grinding 
surface. Mouth oblique, the maxillary just reaching eye; lateral line much decurved; 
dorsal inserted behind ventrals ; pectorals short, not nearly reaching ventrals. 
The females of this species were full of eggs at the time of our visit. Uo worms 
were found in this species. 
6. Leuciscus hydroplilox (Cope). (Plate VIII, Fig. 6.) 
A few specimens, the largest about 4 inches long, were taken in Heart Lake and 
in Witch Creek. This species was previously known from Blackfoot Creek, Idaho, 
* A specimeu over a foot long aud entirely similar to the large chubs of Utah Lake has heeu lately 
sent us by Dr. S. A. Forbes. It was taken with a trammel net in Heart Lake in July, 1890, 
