The flower flies of the subfamily Syrphinae of Canada, Alaska, and Greenland : Diptera: Syrphidae
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Bibliographic Information
The flower flies of the subfamily Syrphinae of Canada, Alaska, and Greenland : Diptera: Syrphidae
（The Insects and arachnids of Canada, pt. 18）（Publication, 1867）
Research Branch, Agriculture Canada, 1992
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