124 
PACIFIC SCIENCE, Vol. II, April, 1948 
Speciation by hybridization either in natural 
or under artificial conditions is often reported 
in the plant kingdom, but it is exceedingly rare 
among animals. Anas oustaleti could have de¬ 
veloped only in the special environment of the 
Marianas Islands, and is therefore noteworthy 
from the viewpoint of evolution. 
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Bonaparte, C. L. 1856. {Paris} Acad, des 
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Danforth, C. H., and G. Sandnes. 1939. 
Behavior of genes in intergeneric crosses. 
Effect of two dominant genes on color in 
pheasant hybrids. Jour. Hered. 30: 537-542. 
Delacour, J., and E. Mayr. 1945. The family 
Anatidae. Wilson Bui. 57: 3-55. 
Hartert, E. 1898. On the birds of the Mari¬ 
anne Islands. Novitates Zool. 5: 66, 69. 
— - 1930. List of the birds collected by 
Ernst Mayr. Novitates Zool. 36: 112. 
Kuroda, N. 1941. [A study of Anas oustaleti.'] 
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— -— 1942. [A study of Anas oustaleti. 
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