Threticus optabilis Krek, 1971

Material examined. Bulgaria: Rila Mts., (site 5) Borovec (Borovets) env., waterfalls, 1 ♂, 3.viii.1981, SW, veg.: Picea, Sorbus, slide Inv. No. 24994, leg., det., Ježek.

Distribution. Currently known to occur in Bosnia and Herzegovina (Wagner 1990; Krek 1971, 1999; Ježek 1985c). First record for Bulgaria.