15. Pimephales promelas, Rafinesque. Black-head Minnow. 



Milk River; Yellowstone River. 



16. Mylocheilus caurinus (Richardson). Columbia River Chub; "White- 



fish." Flathead Lake; Bitter Root River. 



17. Ptychocheilus oregonensis (Richardson). Squaw-fish. 



Flathead Lake; Bitter Root River; Lolo Creek. 



18. Leuciscus balteatus (Richardson). Banded Minnow. 



Brown's Gulch Creek, at Silver Bow. 



19. Notropis atherinoides, Rafinesque. Silverside Minnow. 



Poplar River. 



20. Rhinichthys cataractae dulcis (Girard). Long-nose Dace. 



Beaverhead River; Red Rock River; Poplar River; Little Black- 

 foot River; Browns Gulch Creek; Bridger Creek. 



21. Hybopsis gelidus (Girard). Cold-water Minnow. 



Milk River. 



22. Hybopsis montanus, Meek. Montana Minnow. 



Upper Missouri region. 



23. Couesius dissimilis (Girard). Milk River Minnow. 



Milk River; Poplar River. 



24. Platygobio gracilis (Richardson). Fat-head Chub. 



Milk River; Yellowstone River; Missouri River; Judith River; 

 Poplar River. 



Family HIODONTIDAE. 



25. Hiodon alosoides (Rafinesque). Moon Eye. 



Missouri River Falls; Poplar River. 



26. Hiodon tergisus, Le Sueur. Toothed Herring. 



Missouri River; Judith River. 



Family SALiViONIDAE. 



27. Coregonus williamsoni cismontanus, Jordan. Rocky Mountain 



Whitefish. East Montana generally. 



28. Salmo clarkii, (Richardson). Red-throat Trout. 



Both slopes of the Rooky Mountains. 



29. Cristivomer namaycush (Walbaum). Mackinaw Trout; Lake Trout. 



Elk Lake, Madison County. 



30. Salvelinus parkei (Suckley). Bull Trout; Dolly Varden Trout; Red 



spotted Trout. 



Rattlesnake Creek, and west Montana generally. 

 Family THYMALLIDAE. 



31. Thymallus montanus, Milner. Grayling. 



Tributaries of the Missouri above the Great Falls. 

 Family GASTEROSTEIDAE. 



32. Eucalia inconstans (Kirtland). Stickleback. 



Poplar River. 



Family PERCIDAE. 



33. Stizostedion canadense boreum (Girard). Northern Pike-perch. 



Great Falls of the Missouri; Milk River; Marias River. 



