The flower flies of the subfamily Syrphinae of Canada, Alaska, and Greenland
Subtitle: Diptera : Syrphidae
By: J.R. Vockeroth.
Contributors: Canada. Agriculture Canada. Research Branch.
Series: The insects and arachnids of Canada -- Part 18; Publication / Agriculture Canada -- 1867
Publisher: Ministry of Supply and Services
Published: 1992
Place of publication: Ottawa
Language: eng
Number of pages: 456