HASEMAN, GEOGRAPHICAL DISTRIB UTION IN SO VTH AMERICA 65 



changes wrought by these environments on the more generalized high- 

 land genera is adequate, I believe, to account for the present distribution 

 of the Cichlidse, but this does not explain their point of origin. 



Before taking up this latter subject, it is necessary to produce further 

 evidence showing that it is the action of the environmental complexes on 

 widely distributed genera which has produced the present distribution of 

 the South American fishes and not direct river connections or inter- 

 mingling of species and isolation. 



Eio Amazonas Eegion 

 The following is a list of the Cichlidse of Eio Amazonas : 31 



Chcetobr anchus flavescens, Guapore, 

 semifasciata, 

 ■ Chcetobr anchopsis orbicularis, 

 Cichla temensis, Orinoco, 



ocellaris, Orinoco, Guiana, Guapore, 

 Vraru amphiacanthoides, 

 Acaropsis nassa, Guapore, 

 Astronotus ocellaris, Guiana, Orinoco, 



orbiculatus, 

 Mquidens teteramerus, Essequibo, Guapore, 

 vittata, Colombia, Guiana, 

 Paraguay ensis, Guapore, 

 subocularis, Guiana, 

 portalegrensis, Guapore, 

 dorsigera, Guapore, 

 duopunctata, 

 samorensis, 

 guaporensis, Guapore, 

 awani, Guapore, 

 Cichlasoma bimaculatum, 



festivum, Guapore, 

 severum, Guiana, Guapore, 

 psittacum, Orinoco, 

 spectabile, 

 coryphcenoides, 

 Crenicara altisplnosa, Mamore, 

 maculata, 

 punctulata, Guiana, 



31 This list does not exactly agree with my report from the Carnegie Museum, which 

 was slightly changed by Professor Eigenmann. Perhaps some of the omitted species 

 should be added, but I am inclined to believe more should be dropped, even a few de- 

 scribed by the writer. In the main, however, this is the most accurate list at hand and 

 is sufficient for its present purpose, including as it does all the genera. 



