102 FieE~tp Museum or NaturAL History — Zod Locy, Vor. X.: 
While collecting fishes in Costa Rica I was much aided in way of 
transportation by the United Fruit Company. I also received many 
courtesies from its agents at Lim6én, Zent, Victoria, and San José, also 
from Mr. Zeledon at Parismina. 
Prof. Tristan of San José accompanied me to Orotina and the Rio 
Turribales; Dr. Alfaro assisted me in collecting near San José. He also 
arranged for me transportation to Orotino and return, besides giving 
me the services of his assistant, Mr. Jesus Maria Moran, while I was 
on the western slope of Costa Rica. Dr. Alfaro permitted me to 
examine all of the fresh-water fishes from Costa Rica which he had 
collected from time to time in the past. 
The following is a list of localities where collections were made by 
mein Costa Rica in April, 1912: 
La Junta, small stream near station . . . . . April 7 
Guapilis, Ristmapilis ocho Ko na ae ee a 
Virginia, Rio Virginia oy, eae eerie 
Parisming Pe Parismina. «65-4 al Sot oe ee einen. 
Zent,; Rio Zeawand Rio ‘Cuba. ois ea ea ee 
La Victoria, Rio Zent and tributaries . . . . . Sep 
Zent, RioZent . . Se merit Ls Se nee ae ae 
San José, Rio Maria Aguilas LAP toptnep concn ues Wotan aie ys 
San Jodé; Ree TeS 3. 6s, seis ea eehinaderts ere 
Orotina, Rio‘gapchuca i. A Meigs) 4 ene SG eee. 
” Rio Turrubales . * ste seals Ge? tehe eee ae 
*” “Riotorande . . . ge Do eee 
Jesus Maria, Rio Jesus Maria te his Alachua aga ecben 
San José, aerate gl ase A eg ee Si a 
Costa Rica is a well watered country. The sides of the tall vol- 
canoes are furrowed by many small streams which unite, forming near 
their bases large rivers. The Reventazon from its source to beyond 
La Junta is a raging torrent; the same is true of the Rio Tércoles oppo- 
site on the Pacific side. The smaller streams visited by me on the 
north slope of Voleano Turialba flowed with considerable current over 
rocky or gravelly bottoms. There were only occasional stretches where 
the bottom was smooth enough to permit successful seining. The 
Rio Zent had much less current with a gravelly and sandy bottom. 
In the foot hills above La Victoria there were cascades and rapids. 
The Rio Cuba flowed, where visited, through a marshy region in a 
deep channel. In all of these streams the water was clear. 
On the Pacific slope the streams are much the same as those on the 
