Creosote gall midges are a species of gall-inducing flies in the Asphondylia auripila group (Diptera: Cecidomyiidae).

This group consists of 15 closely related species of flies which inhabit creosote bush (Zygophyllaceae: Larrea tridentata) sensu lato.

[1] They have partitioned the plant ecologically with different gall midge species inhabiting the leaves, stems, buds, and flowers of creosote bush.

Each species induces a uniquely shaped gall but the insects are otherwise morphologically very similar and very difficult to tell apart.

Adult emergence is timed with periods of plant growth associated with winter, spring, or summer rain fall.