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Special Publications of The Museum are numbered separately and published on an irregular basis under the auspices of the Dean of the Graduate School and Director of Academic Pub¬ lications, and in cooperation with the International Center for Arid and Semi-Arid Land Studies. Copies may be obtained on an exchange basis from, or purchased through, the Ex-' change Librarian,

Type species Noctilio albiventer [=albiventris] Spix. CONTEXT AND CONTENT. Order Chiroptera, Suborder Microchiroptera, Superfamily Phyllostomoidea, Family Noctilionidae. The genus Noctilio contains only two species; they may be distinguished on the basis of characters discussed in the account that follows.

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