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MAMMALS OF THE COLLINS-DAY SOUTH 
AMERICAN EXPEDITION.* 
BY WILFRED H. OSGOOD. 
In the latter part of 1914, Mr. Alfred M. Collins of Philadelphia 
and Mr. Lee Garnett Day of New York called upon the writer to discuss 
plans for a trip to South America. As a result of this meeting and 
several subsequent ones, it was. decided by Mr. Collins and Mr. Day 
that they would not only finance but personally conduct an expedition 
to be largely devoted to the collecting of natural history specimens, 
especially mammals and birds. As finally arranged, the party included 
Mr. Collins and Mr. Day and their friend Mr. Willard Walker, who also 
shared in the expense, and representatives of two museums, Mr. George 
K. Cherrie for the American Museum of Natural History of New York, 
and Mr. Robert H. Becker for the Field Museum of Natural History. 
The route chosen led across the continent of South America from west 
to east through Peru, Bolivia, and Brazil. Sailing from New York 
December 26, 1914, the party proceeded via Panama to Mollendo, 
Peru, arriving there on January 15, 1915. Thence they proceeded by 
rail to Arequipa, from which place a short but successful hunting trip 
was made to Pampa de Arrieros, Peru, where specimens of guanacos 
and vicugnas were obtained. Another short stop was made at Puno 
on Lake Titicaca and from there quick time was made by rail and stage 
via La Paz, Oruro, Arque, and Parotani to Cochabamba, Bolivia. 
From Cochabamba it was decided to travel by pack train over a little- 
used and difficult trail to the port of Todos Santos on the Chaparé River, 
an affluent of the Mamoré. Owing to heavy rains, this part of the 
trip was very arduous, but it was successfully accomplished and some 
collecting was done in spite of untoward conditions. On March 16th 
a small steamer left Todos Santos with the expedition and arrived at 
Trinidad on the Mamoré March 20th. Four days later Guajaramerim 
was reached and thence to Porto Velho on the Madeira the party went 
by rail, arriving March 29th. From this point to Manaos, no stops 
were made and, with the exception of Mr. Cherrie who remained on 
*An illustrated general account of this ition written by Mr. Day was 
published in the Asmerionn Museum ad fhe anuary, 1916. 
