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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clarkson, F
    Type: Article
    In: The Canadian entomologist
    Volume: 17
    Date: 1885
    Page Range: 188--190
    Publication Info: Ottawa [etc.], Entomological Society of Canada [etc.],
  2. By: Clarkson, F
    Type: Article
    In: The Canadian entomologist
    Volume: 19
    Date: 1887
    Page Range: 31--34
    Publication Info: Ottawa [etc.], Entomological Society of Canada [etc.],