Darkwing Fungus Gnat

Fungus gnats are small flies in the Family Sciaridae.
• Adults are 2-5 mm (1/5 inch) long, with long, bead-like antennae, long legs and clear
wings with a prominent Y-shaped vein.
• Larvae are legless, white or translucent maggots with a dark head capsule.

Adults are poor flyers and tend to run along the soil surface when disturbed

Source: http://appliedbio-nomics.com/wp-content/uploads/330-fungus-gnats.pdf