Genus Hydrometra Latreille, 1796

Hydrometra gracilenta Horváth, 1899

Hydrometra gracilenta Horváth, 1899: 450 (as new species).

Distribution in Iran. Markazi (Vafaei 2005).

General distribution. Trans palearctic species known in the whole Europe and Russia, very scarce in Mid Asia (Azerbaijan (syntypes cited from this country), Kazakhstan, Turkmenistan, Tadjikistan, Northwestern China, Mongolia) (Andersen 1995).

Hydrometra stagnorum (Linnaeus, 1758)

Cimex stagnorum Linnaeus, 1758: 450 (as new species); Cimex acus De Geer, 1773: 332; Cimex lineola Sulzer, 1776: 98; Cimex angustatus Thunberg, 1784: 59; Hydrometra eremobia Kiritshenko, 1925: 5 .

Distribution in Iran. East Azarbaijan (Khaghaninia et al. 2010b), Fars (Ostovan & Arefnia 2011; Linnavuori 2009), Golestan (Hoberlandt 1959; Safavi 1981a; Modarres Awal 1997), Guilan (Cox & Cox 1995 as H. gracilenta; Linnavuori & Hosseini 2000), Kerman (Wagner 1961), Khorasan (Linnavuori & Modarres Awal 1998), Kordestan (Sakenin et al. 2010; Samin et al. 2011), Mazandaran (Safavi 1981), West Azarbaijan (Gharaat et al. 2009), Zanjan (Askari et al. 2009).

General distribution. Euro-Siberian, Mediterranean basin, Middle Asia, Middle East, North Africa (Andersen 1995; Fent et al. 2011).