56 Field Columbian Museum — Zoology, Vol. V. 



Tigoma conspersa Garman, Bull. Mus. Comp. Zool., 1896, 234; 

 Rio Nazas, Coahuila. 



Lenciscus pur parens Rutter, Proc. Cal. Acad. Sci., 1896, 260; 

 Morse Canon and the Rio Yaqui east of Opsura. 



Leuciscus niger Bean, Bull. Amer. Mus., 1898, 166; San Diego, 

 Chihuahua. 



Northern Mexico, headwaters of the Rio Yaqui, to the head- 

 waters of the Rio Mezquital, the Rio Nazas, and east to Saltillo, 

 Coahuila. (Lerdo; Santiago Papasquiaro; Durango.) 



Head 3* to 4!; depth 4 to \\; D. 8; A. 8; scales 15 to 18-60 

 to 75-8 to 10. Body rather slender, little compressed; head rather 

 long and pointed; snout 3§ in head; mouth moderate, oblique, 

 terminal; the jaws equal, the maxillary about reaching front of eye; 

 eye rather small, 5 to 6 in head; origin of dorsal fin midway between 

 base of dorsal and nostril, its longest ray \]/ z in head; base of dorsal 

 fin 2 in head; pectorals reaching about 2 /i distance to ventrals, 1J/3 

 in head; ventrals if in head; lateral line decurved, complete; caudal 

 fin forked; least depth of caudal peduncle 2}. in head; teeth 2, 4-5, 1, 

 hooked, and with narrow grinding surface. 



Color dusky above, silvery below; some larger specimens with 

 a reddish tinge; young specimens usually have a dark lateral band 

 and a black caudal spot ; the band and caudal spot disappearing with 

 age, being quite absent on specimens over 8 inches in length. Length 

 about 12 inches. A very abundant and variable species. 



Leuciscus intermedius (Girard). 



Tigoma intermedia Girard, Proc. Acad. Nat. Sci. Phila., 1856, 206; Rio San 

 Pedro, tributary of the Gila, Arizona. 



Leuciscus intermedins Jordan & Eyermann, Bull. 47, U. S. Nat. Mus., 1896. 

 235: Gilbert & Scofield, Proc. U. S. Nat. Mus., 1898, 493 (see this ref- 

 erence for synonymy) . 



Leuciscus niger Jordan & Evermann, ibid., 235. 



This species has been taken in Arizona, near the Mexican border. It may 

 occur in northern Sonora. 



Head 3^4 ; depth 3^ to 4; D. 8; A. 8 or 9; scales 15-65 to 80-9. Body elon- 

 gate, heavy forward; head long, rather pointed, broad above, depressed over 

 the eye; interorbital 4^3 in head; mouth large, oblique, the jaws equal, the 

 maxillary just reaching vertical from the eye; dorsal fin slightly behind origin of 

 ventrals; pectorals long, nearly reaching ventrals; 1% in head; ventrals 2 in 

 head; lateral line decurved; teeth 2, 5-4, 2. 



Color dusky, paler below; small specimens with a dark lateral band; fins all 

 dusky. Southwestern Arizona in basin of the Gila River. 



In size and appearance this species is very much like the preceding. 



23. Abramis Cuvier. 



Breams. 



Abramis Cuvier, Regne Animal, Ed. 1, in, 1817. (Type, Cyprinus 

 brama Linnasus.) 



