Author: Townes, H., 1957.:
Title: Neactic wasps of the subfamilies Pepsinae and Ceropalinae. [Bull. U.S. Natl. Mus., 209.]
Description: WAshington 8vo, 24cm. Pp. iv,286, 48 photos on 4 plates, 160 distrib. maps in text, index. Orig. wrappers, uncut. Very good.

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