306 Bulletin 4J, United States National Museum. 



Coloration dark, the males rosy in spring. Active little fishes inhabiting 

 mountain springs, the species very difficult to distinguish, {piy, snout; 

 ixO'v(;,i\s,h] the snout being prominent.) 



«. Snout loug and promini'nt, projoctiug nota)>ly beyond the mouth, about twice length of eye 



in adult ; barbel evident. 



b. Scales 14-C5-8 to 14. cataract*, 507. 



66. Scales 9-60-7. simu.s, 508. 



aa. Snout moder.ate, projecting little beyond the small mouth, its length l}/^ times eye in adult; 



barbel minute or obsolete. atronasus, 509. 



507. KHINICHTHTS CATARACTS (Cuvier & Valenciennes). 

 (Long-nosed Dace.) 



Head 4 ; depth 5 ; eye 2 in snout, 5 in head. D. 8 ; A. 7 ; scales 14-65-8, 

 (62 to 68) ; teeth 2, 4-4, 2. Body elongate, little compressed, not elevated. 

 Head long, the muzzle flattened, narrowed, and extremely pfoniinent, the 

 mouth being entirely inferior and horizontal. Eye nearly median. 

 Isthmus wide. Barbel evident. Pectoral fins enlarged in males. Inser- 

 tion of dorsal nearly median. Color olivaceous, paler below, with numer- 

 ous dusky punctulations ; the back often almost black ; some of the scales 

 usually irregularly darker, producing a mottled appearance ; no distinct 

 black lateralband; young specimens with a dusky lateral shade; ablackish 

 sjiot on the opercle ; males in spring with the lips, cheeks, and lower tins 

 crimson. Length 5 inches. New England to Virginia and Wisconsin; its 

 varieties ranging to Utah and the Columbia Basin, frequenting clear and 

 boisterous streams and rock pools, (cataracta', of the Cataract, the orig- 

 inal type being from Niagara Falls.) 



Gobio cataractsc, CuviER & Valenciennes, xvi, 315, 1842, Niagara Falls. (Coll. M. Milbert.) 

 Leticiscris nasiUus, Ayres, Journ. Best. Soc. Nat. Hist., iv, 18415, 299, West Hartford, Conn. 

 Bhinklithys 7narmoralns, Agassiz, Lake Superior, 354, 1850, Lake Superior. (Type, Ho. 9053.) 



Scales smaller, 10-70-10 ; otherwise similar. Gunther, Cat., vir, 189, 1868. 

 Argijrens nasidus, Cope, Cypr. Penn. 369, 1866. 

 Rhhiichthys nasulHs, GuNTiiEK, Cat., vii, 189, 1868. , 



Ceratidilhyscataracke, GiJs-iHF.ii, Cat., VII, 176, 1868. 

 lildnkhlhys calaracla:, Jordan & Gilbeut, Synopsis, 207, 1883. 



Represented in the Rocky Mountain region on both sides of the divide by 



507a. BHINICHTHYS CATARACT.E DULCIS (Girard). 



Head 4 ; depth 5 to 5i. D. 8 ; A. 7 ; scales 11 or 12-63 to 70-9 to 12. 

 Body elongate, not elevated. Head long, the muzzle long and projecting, 

 as in B. cataractcv, but rather sharper. Barbel evident, but smaller than 

 in i?. cataracta!. Insertion of dorsal a little farther back than in cata- 

 racta', being usually midway between nostril and base of caudal. Silvery; 

 darker above ; a dusky lateral shade, at least in the young ; males largely 

 rosy. Length 5 inches. Headwaters of the Missouri, Platte, Arkansas, 

 and Rio Grande; also throughout the Columbia basin, and in tributaries 

 of Great Salt Lake, the Jordan, Provo, and Bear rivers, with the species 

 of Jj)ocoj>e, which it closely resembles ; abundant in swift brooks, (dul- 

 cis, sweet, first taken in Sweetwater River.) 



