﻿Eigenmann: South America West of the Maracaibo 3 



5. "The University of Michigan Expedition to Santa Marta." 

 The collections of this expedition were lent me for study by Dr. 

 A. G. Ruthven of the Museum of the University of Michigan. 



6. Various collections were received from Colombia, made 

 under the inspiration of Hermano Apolinar Maria, Director of 

 the Museum of the Instituto de la Salle at Bogota. 



7. The extensive collections made and reported upon by the 

 late Seth E. Meek and S. F. Hildebrand for the Smithsonian In- 

 stitution and the Field Museum. 



The types and first series of the first two expeditions and the 

 second series of the Landon Ecuadorian Expedition are in the 

 Carnegie Museum, the types and first series of the third, fourth, 

 and sixth expeditions and the second series of the first two ex- 

 peditions are in the collections of Indiana University. 



Special acknowledgments are due to Mr. Hugh McK. Lan- 

 don, Mr. Carl G. Fisher, and Mr. Will Irwin for providing in 

 large part for the expeditions bearing their names, and to Mr. 

 Arthur Henn, Mr. Charles Wilson, Mr. Arthur Bierhaus, Dr. 

 William Ray Allen, and Miss Adele Eigenmann, volunteer work- 

 ers during the various expeditions. 



Some of the questions concerning the distribution of fresh- 

 water fishes in this area are: 



1. What fishes are found west of the Cordillera of Bogota 

 and on the Pacific slope of Ecuador and Peru? 



2. Where did the ancestors of the present fauna come from? 



3. Is the transandean fauna a unit? 



4. How, where, and when did the fishes get into the Magda- 

 lena and Guayas rivers? 



5. What types of fishes are found in the Chagres river? 



6. How and when did the fishes reach the Chagres? 



7. How did those that succeeded in getting into the Chagres 

 succeed in their migration northward or southward? 



8. What types of fishes are found in the Pacific slope rivers 

 between Panama and Peru? 



9. What relation do the fishes of the Atrato and San Juan 

 bear to each other? 



Some of these questions were well formulated before I began 

 my work. Others have suggested themselves as the work pro- 

 gressed. All of them receive full consideration in the volume 



