A New Race of the Least Bittern From the Pacific Coast
The writers have recently had occasion to compare a series of Least Bitterns (Ixobrychus exilis) from the Pacific Coast with birds from the Atlantic Coast. The latter have, in turn, been compared with such specimens from the Greater Antilles as were available to us, with the following results.
Dickey, Donald R. and Van Rossem, A. J.
"A New Race of the Least Bittern From the Pacific Coast,"
Bulletin of the Southern California Academy of Sciences:
Available at: https://scholar.oxy.edu/scas/vol23/iss1/4