I20 Field Museum of Natural History — Zoology, Vol. X. 



Family Centropomidae. 



Centropomus pectinatus Poey. 



Centropomus pectinatus Poey, Mem., ii, 12, i860 (Havana and 

 Cienfuegos); — Regan, Biol. Cent. Amer., 1906, 46. 



Centropomus medius Regan, Biol. Cent. Amer., iqo6, 47. 



Mr. Regan regards C. pectinatus Poey and C. medius Gunther 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 (i), 290 mm. 



Centropomus undecimalis (Bloch). 



Scicena undechnalis Bloch, Ausl. Fisch., vi, 1792, 60, pi. 203 (Ja- 

 maica) . 



Centropomus undecimalis Regan, Biol. Cent. Amer., 1907, 49. 

 This species occurs onlj'^ 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 Lutianidae. 



Neomsensis 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 (i), 223 mm. 



