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Chrysotoxum flower fly - Chrysotoxum - female

Chrysotoxum flower fly - Chrysotoxum - Female
London, Ontario, Canada
July 13, 2004
IDed as Chrysotoxum sp. by Dr. Jeff Skevington. He thinks it is C. flavifrons but says that the characters are hard to evaluate from a photo. I followed this fly for ten minutes among low shrubs bordering a marshy area; it flew slowly but refused to perch for longer than a second, and this is the only shot that wasn't badly blurred.