FISHES 87 



ds Scales about 74 A. couesi. 



Co Scales less than 70 in the lateral Hne A. adobe. 



A. nevadensis. 

 A. nubila. 

 b; Dorsal fin with 10 or 11 rays, the anterior one spinelike. 



Ci Scales 63 to 70 A. umatilla. 



C2 Scales 52 to 57 A. falcata. 



82 Teeth 4-4 A. chrysogaster. 



A. oscula (Gir.). Length 60 mm.; head 4; depth 4.75; color 

 dusky olive; a scarlet patch above the gill opening and one on the 

 side of the muzzle; scales 18-89-15: lower Colorado and Gila Rivers; 

 not rare. 



A. yarrowi Jordan & Evermann. Length 125 mm.; head 4.1 ; depth 

 5 to 5.5; color dark olive, with 2 ill-defined dark lateral bands; scales 

 16-78-13: Colorado River basin; very common. 



A. couesi (Yarrow). Length no mm.; head 4; depth 4.25; color 

 dark gray; scales 1 2-74-1 1: Colorado River basin. 



A. adobe J. &E. Length 100 mm.; head 3.6; depth 4.5; clay colored, 

 with a dark lateral band; scales 12-63 to 70-10: Sevier River, Utah; 

 locally abundant. 



A. nevadensis (Gilbert). Head 3.5; depth 4; color brown, much 

 speckled above, and with a dark lateral stripe; scales 65: warm springs 

 in the deserts of southwestern Nevada. 



A. nubila (Gir.). Length 85 mm.; head 3.75 to 4.6; depth 3.75 

 to 5; color dark gray, with a faint lateral band; scales 47 to 70, usually 

 52 to 65: coastwise streams of Washington, Oregon and basin of the 

 Columbia to Idaho; Yellowstone Park; southeastern Oregon. 



A. umatilla Gilbert & Evermann. Color dark, mottled; anterior 

 ray of median fins spine-like; scales 13 or 14-63 to 70-7 or 8: Payette 

 and Umatilla Rivers, Idaho. 



A. falcata Eigenmann & Eigenmann. Color dark, mottled; fins 

 falcate; ventral fins with inner rays united with the body; scales 52 to 

 57: Columbia River basin; locally abundant. 



A. chrysogaster Gir. Color dark iron gray, with a darker lateral 

 band; scales 88; teeth 4-4; males with a yellowish belly: Gila River 

 basin. 



28. Hybopsis Agassiz. Horny-heads. Body elongate or robust; a 

 barbel present on each maxillary ; sometimes a second barbel also present ; 

 teeth 4-4 or i, 4-4, i or o, hooked; scales rather large, 35 to 58 in the 

 lateral line; rays of both dorsal and anal fins usually 8: 18 species, 

 mostly in the southern and western States. 



