FAMILY V. CYPRINID.E. 75 



Notropis formosus Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 

 1896, 271: Meek, Field Col. Mus. Pub. 65, 1902, 84; Colonia 

 Juarez. 



Basin of the Rio Casas Grandes. 



Head 3^; depth 3^ to 3^; D. 9; A. 8; scales 10-42 or 48-5. 

 Body elongate, much compressed; head large; snout pointed, 4 in 

 head; mouth moderate, end of maxillary reaching to vertical from 

 anterior margin of eye; teeth 4-4, narrow grinding surface, tips little 

 hooked; eye small, 3^ in head; origin of dorsal fin midway between 

 base of caudal and nostril; about 24 scales in a series between nape 

 and dorsal fin; base of dorsal i^ in head; longest ray i> in head; 

 pectoral i% in head; ventral 1^2 in head; caudal fin forked; caudal 

 peduncle 2 in head; lateral line decurved, complete or absent on a 

 few scales. 



Color dark bluish, much lighter below; a dark band on middle 

 of posterior part of body ; no caudal spot ; vertical fins darkish ; outer 

 margin of first pectoral ray dark. Length 2 inches. 



This species is abundant in the basin of the Rio Casas Grandes. 

 It has not been taken elsewhere. 



68. Nototropis frigidus (Girard). 



Montana frigida Girard, Proc. Acad. Nat. Sci. Phila., 1856, 200; 

 Rio Frio, Texas: Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 271. 



Notropis frigidus Evermann & Goldsborough, Bull. U. S. Fish 

 Comm., 1902, 148; Lago de Santa Maria, Chihuahua. 



Northern Chihuahua to Texas. 



Head 4; depth 4^; D. 7 ; A. 9; scales 5-35-6. Body slender, 

 compressed; head small; mouth small, oblique, lower jaw slightly 

 included; scales thin, deciduous; fins small; origin of dorsal slightly 

 behind base of ventrals. 



Color pale yellowish or straw color; a few dark punctulations 

 along the median line of back. Length about 2 inches. 



A single specimen 2 inches long from a pool near Lake Santa 

 Maria, Chihuahua, seems to be this species, though too badly muti- 

 lated to enable us to identify it with certainty. (Evermann & Golds- 

 borough.) 



Subgenus Nototropis Rafinesque. 



69. Nototropis santarosaliae Meek. 



Notropis santarosalice Meek, Field Col. Mus. Pub. 65, 1902, 85; 



Santa Rosalia. 

 Basin of the Rio Conchos in Chihuahua. 



