So Field Columbian Museum — Zoology, Vol. V. 



74. Agosia oscula (Girard). 



Argyreits osculus Girard, Proc. Acad. Nat. Sci. Phila., 1856, 186; 



Babocomori Creek, a tributary of the Rio San Pedro, Arizona. 



Argyreus notabilis Girard, Proc. Acad. Nat. Sci. Phila., 1856, 186; 



Rio Santa Cruz, a tributary of the Gila, Sonora: Girard, Mex. 



Bd. Sur., 47, pi. xxvn, figs. 5-8, 1859; Rio Santa Cruz, Sonora. 



Agosia oscula Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 



1S96, 309. 

 Tributaries of the Gila River in Arizona and Sonora. 

 Head 4; depth \%\ D. 8; A. 7; scales 18-89-15. Body rather 

 elongate, the caudal peduncle stout; snout obtuse, but narrowed 

 anteriorlv, not overhanging the mouth; maxillary barbels small; eye 

 small, 4 in head. 



Color duskv olive above ; a blackish lateral band ; male with axils 

 of pectorals and ventrals scarlet; a scarlet patch above gill openings 

 and one on side of snout. Length about 3 inches. 



75. Agosia chrysogaster Girard. 



Agosia chrysogaster Girard, Proc. Acad. Nat. Sci. Phila., 1856, 

 187; Rio Santa Cruz, Sonora (Gila Basin): Girard, Mex. Bd. 

 Sur., 49, pi. xxvni, figs. 5-8, 1859; Rio Santa Cruz, Sonora: 

 Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 313: 

 Rutter, Proc. Cal. Acad. Sci., 1896, 260; Morse Canon; Rucker 

 Canon, Yaqui Basin; Hermosillo: Evermann & Goldsborough, 

 Bull. U. S. Fish Comm., 1902, 148; near summit of Sierra 

 Madre. Chihuahua. 

 Northern Sonora and Chihuahua. 



Head 4; depth 4; D. 8; A. 7; scales 88. Body fusiform; head 

 rather heavy; snout conical; maxillary barbel small; mouth terminal, 

 the upper jaw the longer; maxillary reaching about vertical from 

 outer margin of orbit; eye small, 4 in head; fins long. 



Color dark iron gray above, sometimes spotted; a darker band 

 of same along the side above lateral line, extending from end of 

 snout to middle of caudal; males with the belly yellow or orange. 

 Length about 3 inches. 



32. Hybopsis Agassiz. 



Horny Heads. 



Hybopsis Agassiz, Amer. Jour. Sci. Arts, 1854, 358. (Type, 



Hybops is gracilis Agassiz =Rutilus amblops Rafinesque.) 

 Yiiriria Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 321. 

 (Type, Hudsonius alius Jordan.) 



