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  1. By: Bohart, R. M. (Richard Mitchell), - Villegas, Baldomero
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 52
    Issue: 4
    Date: 1976
    Page Range: 331--334
    Publication Info: San Francisco Pacific Coast Entomological Society
  2. By: Spencer, D F - Liow, P-S - Pitcairn, M J - Villegas, Baldomero
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 61
    Date: 2014
    Page Range: 339--349
    Publication Info: Berkeley, California Botanical Society,
  3. By: Villegas, Baldomero - Byers, George W.
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 57
    Issue: 3
    Date: 1981
    Page Range: 385--396
    Publication Info: San Francisco Pacific Coast Entomological Society