Hydrometra okinawana Drake, 1951a: 101. HT: male, Japan, Okinawa; CASC.
Hydrometra yasumatsui Miyamoto, 1964c: 214 (syn. J.T. Polhemus, 1992: 438). HT: male, Japan, Kyushu; KUEC.
Hydrometra akekawati Sites & J.T. Polhemus, 2003: 140 (syn. J.T. Polhemus, 2004: 213). HT: male (micr.), Thailand, Chaiyaphum Pov., Amphur Khon Sarn Tumbon Heuy Yang; Enns Entomology Museum, University of Missouri, Columbia, USA.