review of two Nearctic species of the shore-fly genus Philygria Stenhammar: P. debilis Loew and P. nigrescens (Cresson) (Diptera: Ephydridae)

Two species of the shore-fly genus Philygria Stenhammar, P. debilis Loew and P. nigrescens (Cresson), are reviewed to reassess their taxonomic status, which was recently questioned by Hollmann-Schirrmacher. Both species are distinct, and evidence is presented to support their revised status. For perspective and to facilitate their identification, the appropriate subfamily, tribe, genus, and species are diagnosed and keys to the genera of the tribe Hyadinini and to the Nearctic species of Philygria are presented. Lectotypes, as appropriate, are designated.