i8o FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



169. Chirostoma ocotlanse Jordan & Snyder. 



Chirostoma ocotlana 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. 6160, Leland Stanford Jr. University. 



Head 3/4', depth 4%', D. v-i2; 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 i % in head ; 

 ventrals 2^; base of anal fin iX m 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 12 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 ) 



