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Hi. I took these photos of some Kelp Flies at Hobuck Beach in Neah Bay, Clallam Co., Washington on November 4th. This is in the extreme northwest corner of the Continental United States. One photo shows what looks like a mite(?) attached to the kelp Fly. What is that? They aren't the best photos because the flies move super fast and my available camera equipment wasn't exactly up to the task. Are all of these flies Coelopa sp., perhaps C. vanduzeei? Any help would be appreciated. Thanks!