Dusky Bog Fly

The Dusky Bog Fly (Parhelophilus rex) is a medium-sized, dark-colored, Nearctic flower fly. Adults have a pair of thin gray stripes on the thorax. The hind femur is almost entirely black. The larvae have long breathing tubes which allow them to live in low-oxygen waters thick with decaying organic matter.

Flight season May – July

Flowers: Willow catkins

Similar species: Parhelophilus obsoletus and Helophilus sp.

Parhelophilus rex
Parhelophilus rex – St Louis County – June 2, 2017

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