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  1. Observations on the bionomics of the bee Andrena (Tylandrena) erythrogaster Ashmead (Hymenoptera: Andrenidae) with notes on A. (Micrandrena) personata Robertson and A. (Holandrena c. cressonii Robertson
    Publication info: Champaign, Ill, Illinois Natural History Survey, [1988]
  2. Biological notes
    Publication info: Urbana Illinois Natural History Survey 1933-1988