466 



PATAGONIAN EXPEDITIONS: ZOOLOGY. 



2. Atkerinopsis bonariensis (Cuvier & Val- 

 enciennes), 



Evermann & Kendall, 1906, 95- 

 Habitat: Lakes of Argentina. 



Family POLYCENTRIDyE. 



2. 



Polycentrus Muller & Troschel. 



Type : Polycentrus schomburgkii Mul- 

 ler & Troschel. 

 Range: Guiana and Trinidad. 

 Polycentrus schomburgkii Muller & Tro- 

 schel, Giinther, III, 370. 



Habitat: Essequibo; Orinoco; Trini- 

 dad. 

 Polycentrus tricolor Gill, 



Giinther, I II, 370. 



Habitat :Trinidad. 



Monocirrhus Heckel. 



Type : Monocirrh us poly acanthus 



Heckel. 

 Range that of the single species. 

 Al. Monocirrhus polyacanthus Heckel, 



Giinther, III, 371. 

 Habitat: Rio Cupai and ponds near the 

 Rio Negro. 



Family CENTROPOMID^E. 



Centropomus Lacepede. 



O x y lab r a x Bleeker; Macrocephalus 

 Brown. 

 Type : Sciccna undecimalis Bloch. 

 Range : Marine. Some, possibly all, of 

 the species entering or living in 

 fresh water. 

 Ai. Centropomus medius Giinther, 



J. & E., 11 19. 

 C. grandocnlatus E. & J. ; C. pedimac- 



ula part J. & E. 

 Habitat : Atlantic and Pacific coasts, 

 entering rivers. 

 A2. Centropomus parallelus Poey, 



J. & E., 1 122. 

 C. gabbi and heringi Fowler; C. mexi- 



canus Bocourt. 

 Habitat: Cuba to Bahia; Pacific coast, 

 entering rivers. 

 3. Centropomus undecimalis (Bloch), 



J. & E., 1 1 18. 

 C. undecimradiatus, boubina and aureo- 

 viridis Lacepede ; C. argenteus Re- 

 gan ; C. appcndiculatus Poey. 



Habitat: Atlantic coast, entering rivers. 

 A4. Centropomus pectinatus Poey, 



J. & E., 1 122. 

 C. pedimacula Poey. 

 Habitat : Cuba to Pernambuco, enter- 

 ing rivers. 



5. Centropomus nigrescens Giinther, 



Regan, 50. 

 Habitat : Rio Presidio to Panama. 



6. Centropomus robalito Jordan & Gilbert, 



J. &E., 1123. 

 C. armatus Giinther, non Gill. 

 Habitat: Pacific coast from Mazatlan to 

 Panama, entering rivers. 



7. Centropomus armatus Gill, 



Regan, 1903, 627. 



C. atridorsalis Regan; C. brevis Giin- 

 ther. 



Habitat: Rio Vaqueria near La Tola, 

 northwestern Ecuador. 



8. Centropomus ensiferus Poey, 



Regan, 1906c, 391. 

 C. affiuis Steind. ; C. scaber Bocourt. 

 Habitat: Guiana. 



