FAMILY XIV. ATHERINID.E. 



* 

 179 



FIG. 60. CHIROSTOMA LUCIUS Bouienger. , 



No. 6159 (Chirostoma crystallinum }. & S.), Leland Stanford Jr. University. , 



anterior margin of orbit ; pectoral i ^ in head ; ventral 2^ ; base of anal 

 i^s in head; scales large, a few at nape and pectoral region reduced, 

 the edges of all slightly crenate; scales between dorsal fins very large; 

 gill rakers long and slender, 27 on first gill arch. 



Color light silvery, translucent; a dark lateral silvery band; scales 

 on upper part of body with few dark dots. Length about 10 inches. 



Known at present only from Lago de Chapala and its environs. 



168. Chirostoma lermae Jordan Snyder. 



Chirostoma lermaz Jordan & Snyder, Bull. U. S. Fish Comm., 1900, 

 142, fig. 19; Lago de Chapala: Jordan & Evermann, Bull. 47, 

 U. S. Nat. Mus., 1900, 3163: Meek, Field Col. Mus. Pub. 65, 

 1902, 1 1 6; La Palma; Ocotlan. 



Basin of the Rio Lerma. 



FIG. 61 . CHIROSTOMA LERMXE Jordan & snyder. 



No. 6159, Leland Stanford Jr. University. 



Head 3 y% ; depth 5 ^ ; D . i v or v-i o to 1 2 ; A. 19 to 22; scales 1 8-5 6 . 

 Body elongate, slender, not much compressed; snout long and pointed; 

 mouth large, the lower jaw slightly projecting; mandible 2^ in head; 

 teeth large and strong, in definite rows : the larger teeth on the inner 

 row of the upper jaw and the outer row of the lower; origin of dorsal 

 fin midway between base of caudal fin and eye; pectoral i^ in head; 

 ventral 3 ; scales with crenate edges, those in region of nape and pec- 

 toral fin much reduced. 



Color light silvery, a dark silvery lateral band; few punctulations 

 on scales on dorsal region. Length about 12 inches. 



This species is easily recognized on account of its strong dentition. 

 Known only from Lago de Chapala. 



