pages 236-242 pages, 2 unnumbered leaves of plates : illustrations ; 22 cm

The male genitalia of the cockroach, Periplaneta orientalis, Linn., and their homology with the genitalia in Diptera / by W. Wesché.

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The male genitalia of the cockroach, Periplaneta orientalis, Linn., and their homology with the genitalia in Diptera / by W. Wesché.