xlvi FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



Istlarius balsanus Jordan & Snyder: Cuautla; Jojutla; Puente de Ixtla; Balsas. 



Aztecula vittata (Girard) : Puebla. 



Nototropis boucardi (Giinther) : Puente de Ixtla; Balsas; Cuernavaca; Cuautla, 

 Yautepec; Jojutla; Atlixco; Matamoras; Chietla. 



Tetragonopterus mexicanus Filippi: Puente de Ixtla; Balsas; Cuautla; Yautepec; 

 Jojutla; Atlixco; Chietla; Cuernavaca; Matamoras. 



Gambusia gracilis (Heckel) : Puente de Ixtla; Balsas; Cuautla; Yautepec; Jo- 

 jutla; Chietla. 



Goodea white! Meek: Cuautla; Yautepec. 



Platypcecilus nelson! Meek: Papayo. 



Pcecilia sphenops Cuvier & Valenciennes: Jojutla; Puente de Ixtla; Balsas. 



Melaniris balsanus Meek: Balsas. 



Agonostomus monticola (Bancroft): Balsas; Puente de Ixtla; Cuautla; Jojutla. 



Cichlasoma istlanum (Jordan & Snyder): Puente de Ixtla; Balsas; Yautepec; 

 Jojutla; Chietla; Papayo. 



Chonophorus taiasica (Lichtenstein) : Puente de Ixtla; Balsas; Cuautla. 



LIST OF FISHES FROM VARIOUS LOCALITIES NOT REFERA- 

 BLE TO ANY OF THE RIVER SYSTEMS NAMED ABOVE. 



Tetragonopterus aeneus Gunther: Sanborn, Vera Cruz. 



Symbranchus marmoratus Bloch: Santa Maria, Vera Cruz. 



Characodon furcidens Jordan & Gilbert: Colima. 



Pseudoxiphophorus bimaculatus (Heckel) : Sanborn, Vera Cruz ; Mirador, Vera 



Cruz. 



Pcecilia butleri Jordan: Salina Cruz, Oaxaca. 

 Poecilia sphenops Cuvier & Valenciennes: Santa Maria, Vera Cruz. 

 Xiphophorus helleri Heckel: Sanborn, Vera Cruz. 

 Agonostomus monticola (Bancroft): Ixtapa, near the Bay of Banderas, Jalisco; 



Maria Magdalena Islands; Maria Cleofa Islands; Santa Maria. 

 Joturus pichardi Poey : Misantla. 



Cichlasoma mento (Vaillant & Pellegrin) : Rio Negro, Southern Mexico. 

 Cichlasoma beani (Jordan) : Rosario, Sinaloa. 



Cichlasoma heterodontum (Vaillant & Pellegrin) : Isthmus of Tehuantepec. 

 Cichlasoma melanurum (Gunther) : Santa Maria, Vera Cruz. 

 Ethorichthys helleri (Steindachner) : Santa Maria, Vera Cruz ; Santo Domingo 



de Guzman. 



Philypnus dormitor (Lacpede) : Dominica and Santa Maria, Vera Cruz. 

 Gobius microdon Gilbert: San Juan Lagoon, north of Rio Ahome. 

 Chonophorus nelson! (Evermann): Rosario, Sinaloa. 

 Chonophorus mexicanus Gunther: Santa Maria. 



GEOGRAPHICAL DISTRIBUTION OF FRESH -WATER FISHES 



OF MEXICO. 



In the study of the distribution of fishes over any particular area 

 it is necessary to consider the origin of the fauna or faunas represented, 

 the means and routes of travel, and the significance of the barriers 

 along these routes. None of the fishes in Mexico are able to travel 

 overland, their only highways of travel being the streams and lakes. 



