Browsing by Author "Evans, Howard Ensign."
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Item The genus Psorthaspis on the Mexican central plateau (Hymenoptera, Pompilidae). American Museum novitates ; no. 1662(New York : American Museum of Natural History, 1954) Evans, Howard Ensign.; Hurd, Paul David, 1921-; David Rockefeller Mexican Expedition of the American Museum of Natural History 1947)