"gallflies" in the noun sense
1. gall wasp, gallfly, cynipid wasp, cynipid gall wasp
small solitary wasp that produces galls on oaks and other plants
2. gall midge, gallfly, gall gnat
fragile mosquito-like flies that produce galls on plants
any of various insects that deposit their eggs in plants causing galls in which the larvae feed
Source: WordNet® (An amazing lexical database of English)
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