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Megaselia larvivora Disney, n. sp. is described from a series reared from the caterpillars of Acharia stimulea Clemens and Lithacodes fasciola Herrich-Schaffer feeding on Quercus alba Linnaeus. The fly closely resembles M. fisheri (Malloch), whose recognition is clarified. Observations from the rearing of Megaselia larvivora Disney, n. sp. are reported.

The name Diocophora multichaeta Disney, 2007, for a Neotropical phorid fly, was originally proposed without a holotype. This name is herein validated with a description of the species, Diocophora multichaeta Brown and Disney, new species, illustrations, and designation of a holotype specimen. The identification of specimens determined by Borgmeier (1959) as Diocophora appretiata (Schmitz) is clarified.

Among the insects reported by Copeland (1989) breeding in the waters retained by treeholes in Indiana was a scuttle fly identified by W. H. Robinson as Megaselia scalaris (Loew). It is here reported that in fact this fly, along with fresh material from Illinois and Missouri, is M. imitatrix Borgmeier, whose type series was from Puerto Rico. An aquatic species reported from Texas is recognized as a sibling species of M. imitatrix and is named M. hansonix Disney, sp. nov. A single female from Brazil represents a third species of this complex, thus raising doubts about the identity of specimens from Brazil attributed to M. imitatrix by Benton and Claugher (2000).