Bulletin / 21 (1936-1941)

Parts

  1. Studies of Nearctic aquatic insects. I. Nearctic alder flies of the genus Sialis. II. Descriptions of Plecoptera
    By: Ross, Herbert H - Frison, T H
    Type: Article
    In: Bulletin of the Illinois Natural History Survey
    Volume: 21
    Date: 1937
    Page Range: 57--99
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  2. Descriptions of nearctic caddis flies (Trichoptera), with special reference to the Illinois species
    By: Ross, Herbet H
    Type: Article
    In: Bulletin Illinois Natural History Survey
    Volume: 21
    Date: 1938
    Page Range: 101--183
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