Also known as Large Bee Fly?
Brief description of what you observed
Spotted with Amanda on a little tour of the park! Fun catch. :)
7 August 2015: Observed a non-identified mostly black fly hovering about the first of the four wooden bridges encountered on the Bittern Marsh Trail (when walking it clockwise instead of counterclockwise). This particular fly species was about 1 to 1 1/2" in length. There were at least 10 of these flies very focused on landing on the two by fours that comprised the structure of this small foot bridge. We know not what the purpose of their intensity meant and leave it to those who do know to pray tell. We need an IDentification for this hovering fly. The pattern on its wings is very distinct and may assist in making its IDentity known. While the third image presented here is not well focused it does reveal that this mostly black or dark fly did have some white and/or light blue color on the sides of its abdomen or thorax or both.
LLELA is administered jointly by the US Army Corps of Engineers, the City of Lewisville, Texas, and the University of North Texas.