82 VERTEBRATE AXIMALS OF THE UNITED STATES 



do Scales about 78 A. yarrowi. 



da Scales about 74 4 . couesii. 



C2 Scales less than 70 in the lateral Une A. adobe. 



A. nevadensis. 

 A. nubila. 

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



Ci Scales 63 to 70 A. iimatilla. 



C2 Scales 52 to 57 .1. falcata. 



ao 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. couesii (Yarrow). Length no mm.; head 4; depth 4.25; color 

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



A. adobe]. & 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. 



44. Extrarius Jordan. Teeth one-rowed, 4-4; i or 2 pairs of 

 barbels on the maxillary; 36 to 38 scales in the lateral line; snout pro- 

 jecting: 3 species. 



E. tetranemus (Gilbert). Length 50 mm.; head 4; depth 5.3; color 

 silvery, spotted with black; lateral line with 36 to 38 scales; 2 long 



