They are small, brightly coloured flies that congregate on flowers, feeding on nectar.

The halteres are covered with yellow scales and there is a fringe of flattened hairs on the hind legs.

The larvae are parasitoids of true bugs in the order Hemiptera, including stink bugs in the family Pentatomidae and leaf-footed bugs and squash bugs in the family Coreidae.

[4][5] They are found in North and South America.

This article related to members of the fly subfamily Phasiinae is a stub.