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  Canada Thistle Stem Gall Fly (Tephritidae: Urophora cardui) Male - YouTube

  https://www.youtube.com/watch?v=oxkD1bH6JMI

  Photographed at Grand Forks, North Dakota (20 May 2012). Thank you to Ross Hill (@Bugguide.net) for identifying this specimen!

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  Canada Thistle Stem Gall Fly (Tephritidae: Urophora) Male - YouTube

  https://www.youtube.com/watch?v=lozqi3OxnnU

  Photographed at Turtle River State Park, North Dakota (14 June 2010).

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