Excerpt from Fishes of Western South America: I. The Intercordilleran and Amazonian Lowlands of Peru, II. The High Pampas of Peru, Bolivia, and Northern Chile; With a Revision of the Peruvian Gymnotidae, and of the Genus Orestias

The present report had its inception as a proposed Part II of The Fishes of Northwestern South America. Part I consisted of the studies made by C. H. Eigenmann, Arthur W. Henn, Charles E. Wilson, and others upon the fishes of Colombia, Ecuador, and the Pacific slopes of Peru (eigenmann, 1922b). Later the Fishes of Chile appeared (eigenmann, as a separate monograph. Mean while the results of the studies Of N. E. Pearson made on the Mulford Expedition, extending our work southeastward to tie up with the explorations of J. D. Hase man, were published as Part II (pearson, The work of the Irwin Expedition of Indiana University, in Collaboration with the University of Illinois, 1918 - 1919, was devoted (a) to the completion of the above-named studies on west coast fishes; (b) the Chilean monograph; and (c) the fishes of the highlands of the Peruvian, Bolivian, and Chilean Andes. The first and second-named objectives were carried out principally by Prof. Eigen mann. Through the generous cooperation of the University of Illinois I was able to have a part in the expedition, giving my time principally to the third objective named above. Through the first portion of the journey Prof. Eigenmann was accompanied by his daughter Adele; on the second portion he was unaccompanied. After trying his hand at exploration in the highlands, at Oroya, 12000 feet, and about Cerro de Pasco, 9000 - 14000 feet, and descending the Urubamba from La Raya, 14000 down to Santa Ana, 3000 feet, Dr. Eigenmann found he must re linquish the high mountains in my favor by reasons of health. For the remainder of the time my apportionment was the third objective mentioned above.

In addition to studies of fishes, I collected parasitological materials for the University Of Illinois; earthworms and freshwater sponges being also on the list of desiderata.

Later, 1920, I was sent as traveling fellow of Indiana University to continue exploration on down the eastern slopes of the Andes to the Amazon. Collections made on that, the Centennial, expedition are the principal basis of the present volume.

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