AN ANNOTATED LIST OF FISHES KNOWN TO OCCUR 
IN THE FRESH-WATERS OF COSTA RICA. 
BY SETH EUGENE MEEK. 
The following paper is based on a collection of fishes made by 
myself during April, 1912, and on a number of small collections made 
from time to time by Dr. Anastasio Alfaro, Director of the National 
Museum of Costa Rica. In the list of localities under each species 
Dr. Alfaro’s name follows those localities where specimens. were col- 
lected by him. 
The following is a list of localities arranged according to river basins. 
The figures give in meters the approximate altitude of each locality. 
Rio Reventazon Basin, Atlantic;— La Junta (65); Chitaria (340); 
El Guayabo (360); Turrialba (621); Tucurrique (941); Juan 
Vifias (1000); Rio Iroquois (?); Quebrada de los Negros (?). 
Rio San Juan Basin, Atlantic;— Costa Rica River, one half day’s 
ride from Guapilis (100). 
Rio Colorado Basin, Atlantic;— Guapilis (250); Virginia (350). 
Rio Parismina Basin, Atlantic;— Parismina (240). 
Rio Matina Basin, Atlantic;— Zent (20); Cuba River near Zent 
(20); La Victoria (50). 
Rio Tarcoles Basin, Pacific;-- El Sardinal, Santa Clara (60); Rio 
Turrubales (200); Orotina=Santo Domingo (250); Turrticares 
(300); Rio Siquiares (500); Irazi (1100+); Tiribi (1160); San 
José (1165); Rio Maria Aguilar (1165); Patarra (1180); Tobosi 
(1200); San Isidro (1260); Pacaca (1500). 
Rio Diquis Basin, Pacific;— Rio Grande de Térraba (367); Buenos 
Aires de Térraba (389); Boruca (563). 
Rio Ballena Basin, Pacific;— Ballena (100); Rio Ballena (100). 
Rio Tempisque, Pacific;— Las Cafias (50); Higuer6én (50); Las 
Lajas, Taboga (50); Vol. Tenorio (?). 
-Rio Jesus Maria Basin, Pacific;— Jesus Maria at mouth of Rio 
Machuca (50); Orotina, Rio Machuca (250). 
Rio Guacimal Basin, Pacific;— El Sardinal, Santa Clara (60). 
Pacific;— Sumbres (?); Paso Agres (?); Brazo Seco (?); Punta 
Arenas (3); Tivives (10). 
Io! 
