i8o Field Columbian Museum — Zoology, Vol. V. 



169. Chirostoma ocotlanse Jordan & Snyder. 



Chirostoma ocotlance Jordan & Snyder, Bull. U. S. Fish Comm., 

 1900, 140, fig. 18; Lago de Chapala, Ocotlan: Jordan & Ever- 

 mann, Bull. 47, U S. Nat. Mus., 1900, 3163: Pellegrin, Bull. 

 Mus. Hist. Nat. Paris, 1901, 205; Estado de Jalisco: Meek, 

 Field Col. Mus. Pub. 65, 1902, 116; Ocotlan; La Palma. 



Basin of the Rio Lerma. 



Fig. 62. Chirostoma ocotlan/e Jordan & Snyder. 



No. 61&0, Leland Stanford Jr. University. 



• Head 3^; depth 4^; D. v-12; A. 20 to 24; scales 17 to 19-54 to 57. 

 Body elongate, somewhat compressed; head broad, profile with slight 

 angle at nape; mouth large, the lower jaw much projecting; mandible 

 1 1 in head; teeth small, in bands in both jaws; no teeth on vomer or 

 palatines; eye 4^ to 4^ in head; origin of dorsal fin midway between 

 base of caudal and anterior margin of the eye ; pectorals 1 % in head ; 

 ventrals 2^; base of anal fin 1^ in head; scales with crenate edges, 

 those on nape and about base of pectoral fin much reduced in size; 

 gill rakers long and slender, about 25 on first gill arch; vertebrae 44. 



Color light silvery, translucent; sides with a narrow dark silvery 

 band; scales on upper part of body with few punctulations. Length 

 about 1 2 inches. 



This species is easily recognized because of its much projecting 

 lower jaw. 



170. Chirostoma estor Jordan. 



Chirostoma estor Jordan, Proc. U. S. Nat. Mus., 1879, 298; Lago 



de Chapala: Jordan & Snyder, Bull. U. S. Fish Comm., 1900, 



141. 

 Atherinichthys albus Steindachner, Anzeiger de Kais. Akad. Wiss. 



Wien, 1894, 148; Lago de Patzcuaro, Michoacan. 

 Lethostole estor Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 



1896, 792, and 1900, 3165. 

 Chirostoma album Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 



1900, 3165. 

 Basin of the Rio Lerma and the Valley of Mexico (Xochimilco.) 



