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  1. By: Bell, Ernest L. (Ernest Layton), - Dos Passos, Cyril F. (Cyril Franklin),
    Publication info: New York, N.Y, American Museum of Natural History, [1954]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.57,89M(7)  Arizona  Butterflies  Central America  Classification  Insects  Megathymidae  Megathymus aryxna  Nomenclature  North America  Prescott Region  Type specimens
  2. By: Bell, Ernest L. (Ernest Layton),
    Publication info: New York City, The American Museum of Natural History, [1938]
    Holding Institution: American Museum of Natural History Library
    Subjects: Brazil  Butterflies  Classification  Colombia  Hesperiidae  Insects  Megathymidae  Mexico