120 Fretp Museum or NATURAL History— Zo6étocy, VoL. X. 
Family Centropomide. 
Centropomus pectinatuS Poey. 
Centropomus pectinatus Poey, Mem., m1, 12, 1860 (Havana and 
Cienfuegos) ;— Regan, Biol. Cent. Amer., 1906, 46. 
Centropomus medius Regan, Biol. Cent. Amer., 1906, 47. 
Mr. Regan regards C. pectinatus Poey and C. medius Ginther as 
closely related but different species, the former occurring on the Atlantic 
side, the latter on the Pacific. The studies of Mr. Hildebrand and 
myself, of a considerable amount of material from both coasts of Panama, 
leads us to consider that but one species exists. In the streams in Costa 
Rica I obtained this species only on the Pacific side. 
Jesus Maria (17), 93 to 285 mm.; Rio Grande, Orotina (1), 290 mm. 
Centropomus undecimalis (Bloch). 
Sciena undecimalis Bloch, Ausl. Fisch., v1, 1792, 60, pl. 203 (Ja- 
maica). 
“  Centropomus undecimalis Regan, Biol. Cent. Amer., 1907, 49. 
This species occurs only on the Atlantic side of tropical America. 
Zent, April 12 (3), 183 to 193 mm. 
Centropomus robalito Jordan and Gilbert. 
Centropomus robalito Jordan & Gilbert, Proc. U.S. Nat. Mus., 1881, 
462 (Mazatlan; Acapulco) ;— Regan, Biol. Cent. Amer., 1907, 
51. 
This species occurs only on the Pacific side of tropical America. 
Jesus Maria (2), 211 to 227 mm. 
Family Lutianide. 
Neomeensis argentiventris (Peters). 
Mesoprion argentiventris Peters, Berlin. Monatsbr., 1869, 704 
(Mazatlan). 
This species is more often taken in fresh and brackish water than 
in the sea. 
Jesus Maria (1), 223 mm, 
