80 ATHERINID.^: SILVERSIDES 



Chirostoma crystallinum Jordan and Synder, Bull. U. S. Fish Comm., 19, 139, 

 figs. 16, 17, 1899 (1900) ; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, 

 pt. 4, 3162, 1900. 

 Type-locality. — "Laguna de Chapala, near Ocotlan, Jalisco, Mexico." 



Range. — Lake Chapala, Mexico. 



127, Chirostoma diazi Jordan and Snyder, 1900.'^*- 

 (Plate VIII, Fig. 32) 

 Chirostoma diazi Jordan and Snyder, Bull. U. S. Fish Comm., 19, 137, fig. 15, 

 1899 (1900) ; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 4, 3161, 

 1900; Regan, Biol. Centr.-Amer., Pisces, 62, 1907. 

 Type-locality. — "Market of Guadalajara, Jalisco, Mexico, . . . said to have 

 come from Lake Chapala." 

 Chirostoma sphvr.ena Jordan, Bull. U. S. Fish. Comm., 19, 137, 1899 (1900) 

 (footnote) ; Meek, Publ. Field Mus. {Zool.) 3, 116, 1902; 5, 177, fig. 59, 1904 

 (not C. SPHYR.ENA Boulenger, Me Regan, /. c ). 

 Range. — Lake Chapala, Mexico. 



128. Chirostoma sphyraena Boulenger, 1900.^'- 

 (Plate IX, Figs. 35, 36) 

 Chirostoma sphyr^^ina Boulenger, Ann. Mag. Nat. Hist. (7), 5, 55, 1900; Regan, 

 Biol. Centr.-Amer., Pisces, 63, pi. 9, fig. 2, 1908. 

 Type-locality. — Lake Chapala, Mexico. 

 Chirostoma lerm^ Jordan and Snyder, Bull. U. S. Fish. Comm., 19, 142, fig. 19, 

 1899 (1900) ; Jordan and Evermannn, Bull. U. S. Nat. Mus., 47, pt. 4, 3163, 

 1900; Meek, Publ. Field. Mus. (Zool.). 3, 116, 1902; 5, 179, fig. 61, 1904. 

 Type-locality.— ''Market of Guadalajara; said to have come from Laguna de 

 Chapala, Jalisco, Mexico." 

 Range. — Lake Chapala, Mexico. 



The teeth are stronger in this species than in any other American 

 atherinid. They are set in sockets, which are, however, shallower than 

 those of SPHYR.ENA, which genus this species greatly resembles. The 

 teeth are usually in two series, but a third series in some specimens is 

 interpolated between the main two. 



A young specimen from La Palma, 74 mm. long to caudal, shows 

 all the distinctive features of the species. 



129. Chirostoma ocotlane Jordan and Snyder, 1900.'^'- 



(Plate IX, Figs. 33, 34) 



Chirostoma lucius Boulenger, Ann. Mag. Nat. Hist. (7). 5, 54, 1900 (in part, 



fide Regan). 

 Chirostoma ocotlane Jordan and Snyder, Bull. U. S. Fish Comm., 19, 140, fig. 18, 

 1899 (1900) ; Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 4, 3163, 

 1900; Pellegrin, Bull, ^fus. Hist. Nat. Paris, 7, 205, 1901; Meek, Publ. Field 

 Mus. {Zool.), 3, 116, 1902; 5, 180, fig. 62, 1904; Regan, Bio. Centr.-Amer., 

 Pisces, 62, pi. 9, fig. 1, 1907. 

 Type-locality.— "Lago de Chapala, near Ocotlan, Jalisco, Mexico." 

 Range. — Lake Chapala, Mexico. 



