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Is this fly in Muscidae? It is hard to get a good look at the arista, but they seem to be lightly haired?not dramatically plumose, but not bare, either.

This is another fly that was feeding at the Sugar Maple sap. Length was 8.0 mm from the front of the eyes to the rear of the abdomen.

Woodlands, West Virginia USA.

While I was lying very still photographing this fly, I heard a loud rustling in the leaves and a buck (antlered white-tailed deer) came up behind me. He was very close and I snapped a few photos, but my camera was really set up for flash pictures of flies, and so the deer pictures aren't great. Still, it was fun to see him. We see a lot more does than bucks.