This endangered fly can only be found in the Ballona Creek in California. The status of the fly in Mexico is unknown. Little is known about the requirements for its habitat.
The Belkin's Dune Tabanid fly has large expanded opalescent eyes. The females use their proboscis to pierce.
The diet is uncertain. The males sometimes consume nectar, honeydew and plant juices.
Little is known about the reproductive biology of this insect. Adults fly in May to July. It breeds on littoral sand dunes.
This fly is very rare because of the destruction of its habitat. This insect is thought to appear in the El Segundo Blue Butterfly Preserve in Los Angeles. More research needs to be made about this insect and its known habitat, the sand dunes, should be protected.