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I don't have the arista in focus but I have several nearly in focus views that convince me it doesn't have a large plume and probably none at all.

Views of head with the back half of the front more or less in focus (from the set linked below the original picture):
http://www.flickr...8/sizes/o/
http://www.flickr...7/sizes/o/

And a top view that didn't get the top in focus:
http://www.flickr...172652211/

Is Eutrichota formerly part of Pegomya?