One species, Paradiplosis tumifex (Gagné), n. sp., is responsible for the gall [needle gall of balsam fir]; the other, Dasineura balsamicola (Lintner), is an inquiline that enters the newly forming gall and eventually indirectly kills the larva of P. tumifex.
”- Eben A. Osgood, RJ Gagne: (1978) Biology and Taxonomy of Two Gall Midges (Diptera: Cecidomyiidae) Found in Galls on Balsam Fir Needles with Description of a New Species of Paradiplosis©