Family V. Cyprinid^e. 79 



30. Rhinichthys Agassiz. 

 Black-nosed Dace. 

 Rhinichthys Agassiz, Lake Superior, 353, 1S50. (Tvpe, Cyprians 



atronasus Mitchill.) 

 Body elongate, not much compressed; mouth small, subinferior; 

 the upper jaw not protractile; the upper lip continuous with the 

 skin of the forehead, forming a very broad frenum; a small barbel 

 on end of maxillary; scales very small; lateral line complete; teeth 

 2, 4-4, 2 or 1, hooked, and without grinding surface ; intestinal canal 

 short. Species few, inhabiting springs and running water. 



73. Rhinichthys simus Garman. Southern Dace. 



Rhinichthys simus Garman, Science Observer, 1881, 61; Coahuila: 

 Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 307: 

 Meek, Field Col. Mus., Pub., 65, 1902, 86; Santa Rosalia. 



Tributaries of the Rio Grande in northern Mexico. (Monte- 

 morelos.) 



Head 3^; depth 4*; D. 8; A. 8; scales 12-62-8. Body elongate, 

 little compressed; head depressed; snout blunt, its length 2^ in 

 head; mouth inferior; lips thick; eye small, 5^3 in head; interorbital 

 area 3-^ in head ; origin of dorsal fin midway between base of caudal 

 and nostril; pectoral fin large, nearly reaching ventrals, its length 1% 

 in head; ventrals 1% in head; caudal fin forked; caudal peduncle 

 strong, its least depth i x /(, in head; lateral line complete, nearly 

 straight. 



Color light brownish; young with a dark lateral band and small 

 caudal spot, disappearing in the largest specimens. Length about 

 3 inches. Spawning time the last of May and early in June. 



31. Agosia Girard. 

 Agosia Girard, Proc. Acad. Nat. Sci. Phila., 1856, 186. (Type, 



Agosia chrysogaster Girard.) 

 Apocope Cope, Hayden's Geol. Sur. Mont., 1871-4, 472. (Type, 



Apocope caningtoni Cope.) 

 Body elongate, not much compressed; head long; snout blunt; 

 maxillary with a terminal barbel; premaxillaries protractile; scales 

 small, 60 to 90 in the lateral series; teeth 4-4, 1, or 2, 4-4, 1 or 2 ; intes- 

 tinal canal short. A genus which much resembles Rhinichthys . 



KEY TO THE SPECIES OF AGOSIA. 



a. Teeth 1, 4-4, 1; body elongate, its depth 4^ page 



in the body oscula 80 



aa. Teeth 4-4, body rather deep, its depth 4 in body . .chrysogaster 80 



