Abstract
IT IS ONLY a first, in fact a very crude approximation, to include the Gulf coast of Baja California and the tip of the peninsula in the tropical Panamic Province and the rest of the outer coast in the warm-temperate (San Diegan) division of the Californian Province. The faunal changes along the outer coast of Baja California, in particular, are neither so abrupt nor so regular as to justify drawing definite boundaries to such provinces. The facts of the distribution of life along this coast emphasize the serious doubts that may be entertained regarding the wisdom of attempting a definite areal zoogeographic classification along an hierarchic system. It may well be more meaningful and dynamic to treat each areal faunal assemblage as a complex of faunal elements of diverse provenance, as Mayr (1946) and Parkes (1958) have done for the birds of North America.
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