Key to flies of the families Lonchaeidae, Pallopteridae, and Sapromyzidae of the Eastern United States with a list of the specie
By Malloch, J.R. and McAtee, W.L.
Full title is "Key to flies of the families Lonchaeidae, Pallopteridae, and Sapromyzidae of the Eastern United States with a list of the species of the District of Columbia region"
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