FAMILY XIV. ATHERINID.E. 169 



mm. Scales in the region of dorsal fins larger, PAGE 



less than 15 in a series between the two 

 fins. 



n. Scales in the lateral series 54 to 60. 

 o. Lower jaw projecting but little beyond 



the upper, mandible about 2^ in head, 

 p. Teeth weak, in patches, not arranged 

 in definite rows; gill rakers 4+23; 

 scales 18-56 to 60; mandible 2% in 



head Lucius 178 



pp. Teeth large and strong, in two definite 

 rows, the larger teeth on inner row of 

 upper jaw and outer row on lower; 

 mandible 2^ in head; gill rakers 



5 + 20; scales 2058 lermce 179 



oo. Lower jaw projecting much beyond 

 the upper; mandible if in the head; 

 teeth on jaws small, in bands; scales 

 19-54 to 57; gill rakers 5 + 20; base of 



anal fin 1% in head, its rays 20 ocotlana 180 



nn. Scales in the lateral series 70, transverse 

 18; teeth on jaws large and numerous, 

 not arranged .in definite rows; usually 

 i to 3 large teeth on vomer ; base of anal 

 -ifA in head, its rays 18 to 19 estor 180 



Subgenus Eslopsarum Jordan. 

 154. Chirostoma Jordan! Woolman. 



Chirostoma brasiliensis Jordan, Proc. U. S. Nat. Mus., 1879, 299; 

 Lago de Chapala. 



Chirostoma jordani Woolman, Bull. U. S. Fish Comm., 1894, 62; 

 Rio Lerma, Salamanca, Guanajuato, and 64, City of Mexico: 

 Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 793 : B. A. 

 Bean, Proc. U. S. Nat. Mus., 1898, 540; Lago de Cuitzeo, 

 Michoacan: Meek, Field Col. Mus. Pub. 65, 1902, 112; Chalco; 

 Texcoco ; Xochimilco ; Aguas Calientes ; Lagos ; Ocotlan ; Acam- 

 baro; Huingo. 



Atherinichthys brevis Steindachner, Anz. der Kais. Akad. vViss., 

 Wien, 1894, 149; Lago de Cuitzeo, Michoacan. 



Eslopsarum jordani Jordan & Snyder, Bull. U. S. Fish Comm., 

 1900, 133; Rio Verde, Aguas Calientes: Jordan & Evermann, 

 Bull. 47, U. S. Nat. Mus., 1898, 3157: Evermann & Goldsbor- 

 ough, Bull. U. S. Fish Comm., 1900; Yautepec, Morelos; these 



