xl FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



on which are a number of fresh-water lakes; one of these, Lago de 

 Chapala, is the largest fresh-water lake in Mexico. 



A number of lakes in this drainage basin have no outlet, and in 

 some, as Lago de Patzcuaro and Lago de Cuitzeo, the water is quite 

 brackish. The fishes of this drainage basin are quite distinct from 

 those of the neighboring rivers. The Valley of Mexico was no doubt 

 formerly a portion of this river basin. The fishes found in the Rio 

 San Juan at San Juan del Rio indicate that the head waters of that 

 river were also at one time a tributary of the Lerma. 



The following is a list of fishes known from this river system : 



Lampetra spadicea Bean: Guanajuato; Tanganzicuaro; Chapala. 



Amiurus dugesi Bean: Turbio; Guanajuato; Salamanca; La Barca; La Palma; 



"Estado de Jalisco"; Ocotlan; Chapala. 

 Myzostoma austrinum Bean: Piedad; Salamanca; Aguas Calientes; Ataquiza; 



Ocotlan; La Palma. 



Xystrosus popoche Jordan & Snyder: Chapala; Ocotlan; La Palma. 

 Algansea tincella (Cuvier & Valenciennes): Salamanca; Aguas Calientes; Lagos; 



Celaya; Acambaro; "Estado de Jalisco." 

 Algansea dugesi Bean: "Lago de Yuriria." 

 Algansea rubescens Meek: Ocotlan. 

 Algansea lacustris Steindachner: Patzcuaro. 



Falcula chapalae Jordan & Snyder: Chapala; Ocotlan; La Barca; La Palma. 

 Aztecula lennae (Evermann & Goldsborough) : Lerma. 



Nototropis calientis Jordan & Snyder: Aguas Calientes; Ocotlan; Acambaro. 

 Hybopsis altus (Jordan) : Tupataro; Salamanca; Rio Cuitzeo; Lagos; Aguas Cal- 

 ientes; Acambaro; Celaya. 



Zoogoneticus cuitzeoensis (B. A. Bean): Cuitzeo; Ocotlan; La Barca. 

 Zoogoneticus dugesi (Bean): Guanajuato; Patzcuaro; Lagos. 

 Zoogoneticus robustus (Bean) : Chapala; Cuitzeo; Ocotlan; Patzcuaro; Zirahuen; 



"Guanajuato." 



Zoogoneticus maculatus Regan: Rio Santiago. 

 Zoogoneticus diazi Meek: Patzcuaro; Zirahuen. 

 Characodon multiradiatus Meek: Lerma. 

 Characodon eiseni Rutter: Tepic. 

 Characodon variatus Bean: Salamanca; Aguas Calientes; Lagos; Ocotlan; 



Huingo; Celaya; "Guanajuato." 

 Characodon lateralis Gunther: "Estado de Jalisco." 

 Chapalichthys encaustus (Jordan & Snyder): Chapala; Ocotlan; La Barca; La 



Palma; "Estado de Jalisco;" 

 Gambusia infans Woolman: Salamanca; Celaya; Ocotlan; La Barca; Huingo; 



"Lago de Zacoalco." 

 Goodea luitpoldi (Steindachner): Patzcuaro; Ocotlan; La Barca; La Palma; 



"Lago de Zacoalco." 

 Goodea atripinnis Jordan: Aguas Calientes; Celaya; Acambaro; Huingo; Leon; 



Lagos. 



Skiffia multipunctata (Pellegrin) : Ocotlan; Jalisco (Estado). 

 Skiffia lermae Meek: Celaya; Patzcuaro. 

 Skiffia variegata Meek : Zirahuen. 

 Skiffia bilineata (Bean): Huingo; "Rio Lerma, Guanajuato." 



