Ashlock, 1967 (Orsillinae, rev.); Ge & Li, 2019 (key and distribution of species of the Mongolian Plateau); Horváth, 1890 (Pal. spp., rev.); Nakatani, 2015 (revision Japanese spp.); Péricart, 1999a (monogr.); Schmitz & Péricart, 1993 (Pal. spp., class.); J.A. Slater, 1964a (World cat.); Stål, 1872c; Wagner, 1958v (Pal. spp., rev.).