Haskman : Exi>F.i)iTiON TO Central South America. 291 



Journeys Nos. y and S. To San Juan and the Rio Colorado. From 

 February iS to March i-j, iqoq. 



I''r()in Buenos Ayres I nuide two (rips, one to San Juan, and the other 

 to the Rio Colorado. Hotli of these trips revealed the i)aucity as 

 well as the similarity of the life of the two regions. 



Journey Xo. g. Paraguay basin to Sao Luiz de Caceres, and 

 thence to Manaos. From March 75 to November 10, iqoq. 



I took a boat from Buenos Ayres for Asuncion, Paraguay, and went 

 to the creeks near Sapucay and to Villa Hays. I went up the Para- 

 guay River to Corumba, near which point I collected in the Urucum 

 Mts., and in eastern Bolivia at Puerto Suarez. I went on up the 

 Paraguay River to Sao Luiz de Caceres, whence I started on a trip 

 by ox-cart via San Matias, Bolivia, along the trail to San Ignacio 

 as far as Las Encruziajas, where I turned to the north in order to 

 reach a farm called Bastos, situated on the banks of the Rio Alegre. 

 Then I went down the Guapore River as far as the fort at Principe da 

 Beira, where there are some dangerous rapids during the dry season. 

 On account of the rapids and reputedly bad Indians I went up the 

 Rio Machupo to San Joaquin, and took an ox-cart over to the Marmore, 

 where I fished some time at a farm called Berlin. I went down the 

 Marmore River to Guaja Mirim and then to Villa Bella, which is 

 situated at the fork of the Rios Marmore and Beni. I then went over 

 the various Madeira falls to Sao Antonio de Rio Madeira, where I 

 boarded a small steamer for Manaos. The chief results of this long 

 trip were: 



1. A large collection of aquatic forms from a little known region. 



2. The conviction on my part that there is no connection between 

 the Paraguay and Amazon basin through which a wholesale exchange 

 of fishes has taken place. 



3. The majority of the species of fishes have been able to pass all 

 of the Madeira falls. 



4. Certain swamp-loving species of fishes are found in the head- 

 waters of nearly all of the Brazilian rivers. 



5. The belief on my part that no species of large fishes have ever 

 passed from the headwaters of any river basin into that of another. 



Journey Xo. 10. The Lower Amazon basin. From Xovember 10, 

 IQOQ, to January 25, iQio. 



From Manaos I went to Santerem, where large collections were 



