46 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The following is a list of the species of fishes found by us iu the park, with a list 
of the localities from which specimens of each were actually obtained : 
Catostomidas (Suckers). 
1. Catostomus griseus (Girard). Gardiner River (below Mammotb Hot Simugs). 
2. Catosfowtts ardcHS Jordan & Gilbert. Witch Creek; Heart Lake. 
Cyprinidae (Minnows, Chubs, etc). 
3. RMnichihgs diilcis (Girard). Gardiner River (below Mammoth Hot Springs). 
4. Agosla nuhila {GiTni-d). Witch Creek; Heart Lake. 
5. Leticiscus airarius (Girard). Witch Creek. 
6. Leuoiscus hgdrophlox (Cope). Heart Lake ; Witch Creek. ‘ 
Thymallidae (Grayling). 
7. Tliymallus signifer Richaxdsou. Horse-thief Spring; Madison River ; Gallatin River.* 
Salmonidae (Trout, etc.). 
8. Coregomis williamsoni Girard, var. eismontanus Jordan. Horse thief Spring ; Madison River, 
Gardiner River (below falls) ; Yellowstone River (below the falls). 
9. Salmo myhiss Walbaum. The “ Red- throated,” Cat-throat, or “Rocky Mountain Trout.” Heart 
Lake; Henry Lake; Howard Creek; Yellowstone Lake; Yellowstone River (above falls); 
Yellowstone River (at Livingston); Gardiner River (below falls); Black-tail Deer Creek; 
Alum Creek ; Solution Creek; Riddle Lake ; Canon Creek ; Madison River. 
10. Cottas hairdi Git&vd, (yax. gmnctalatas Gill) ; Gibbon River (above falls) ; Canon Creek ; Horse- 
thief Spring. 
Iu August and September, 1889, plants of fishes were made by the U. S. Fish 
Commission as follows : 
Eastern Brook Trout (Salvelinas fontinalis), iu Glen Creek and in Gardiner River above the falls (5,000 
lishes). 
Rainbow Trout (Salmo irideas), in Gibbon River, above Virginia Cascades, (1,000 fishes). 
Loch Leveu Trout (Salmo tratta levenensis) in Firehole River above Keppler’s Cascades (1,000 fishes). 
Mountain Whitefish (Coregoaus williamsoni). One thousand fishes in each of the Twin Lakes ami iu 
Yellowstone River below the lake. 
Red-throat Trout {Salmo ^nylciss), in Lava Creek above the falls. 
THE FISHES OF THE PARK. 
The following notes are those ihade by us on the species of fishes collected in the 
Park : 
1. Catostomus griseus Girard. (Acomus lactarias Girard; Catostomus retropinnis Jordan.) (Plate 
VII, Fig. 1.) 
This sucker is abundant in the Yellowstone and Gardiner Rivers below the falls, 
and numerous young specimens were taken by us in Gardiner River near the bridge 
below the mouth of the Hot .River. Ko large examples were seen, but the species is 
said to reach a length of 18 inches. 
These specimens apparently belong to the form described by Girard from the Milk 
River, Montana, under the name of Acomtts lactarius. This is probably a slight va- 
riety, or perhaps it is identical with the species found iu the Platte Valley, and 
described by Girard under the name of Acomus griseus. It is probable that Catosto- 
mus retropinnis JoiMau (from the Milk River and the Platte) was based on adult spec- 
imens of Catostomus griseus, a species very close to Catostomus catostomus. 
* Sf)ecimen8 not seen by us. 
