As far as known, the species form galls on grasses... Both [Homaluroides] ingratus and [H.] gramineus were described from material reared from gall-like swellings on grasses, the former from Muhlenbergia mexicana (L.) Trin., the latter from an unknown grass. The former has subsequently been reared from other species of Muhlenbergia.
β- Sabrosky, Curtis W.: (1980) New genera and new combinations in nearctic Chloropidae (Diptera)Β©
Reference: https://www.biodiversitylibrary.org/page/16255084#page/455