a small fly of the family Cecidomyidae whose pink or yellowish larvae (maggots) cause many kinds of small galls on plants, generally on leaves, roots, cones (cone midges), seeds, or twigs —note some gall midges give rise to pockets of resin in the bark of conifers (pitch midges), e.g., maple leaf spot gall midge, balsam gall midge, and birch midge This definition last updated 10/24/2008