The assassin bug subfamily Tribelocephalinae (Hemiptera: Heteroptera: Reduviidae) from Japan, with descriptions of eight new species in the genera Opistoplatys and Abelocephala Author Ishikawa, Tadashi Author Cai, Wanzhi Author Tomokuni, Masaaki text Zootaxa 2015 3936 2 151 180 journal article 10.11646/zootaxa.3936.2.1 e202312c-4686-47ed-bbd2-d470a62d5e4a 1175-5326 241991 157EDA4A-00A3-469F-8234-7E7175BF13E7 Genus Opistoplatys Westwood Opistoplatys Westwood, 1835 : 447 . Type species: Opistoplatys australasiae Westwood, 1835 , by monotypy. Decius Stål, 1860 : 263 . Type species: Cimbus terrens Stål, 1854b (= Opistoplatys australasiae Westwood, 1835 ), by monotypy. (Synonymized by Stål, 1862 : 444 .) Pangeranga Distant, 1906 : 365 . Type species: Pangeranga cinnamomea Distnat, 1906 , by original designation. (Synonymized by Bergroth, 1921 : 67 .) Opistoplatys , the type genus of the tribe Opistoplatyini Bergroth, 1921 , is the second largest genus after Tribelocephala Stål, 1854 ( Stål, 1854a ) , in the subfamily Tribelocephalinae and to date includes 32 described species from the Oriental and Australian regions ( Maldonado Capriles 1990 , 1996 ). Diagnostic character states of this genus are: head, thorax, and legs densely covered with long and short setae; head oblong to elongate, longer than pronotum; clypeus not projected anteriad; interocular space narrower than eye in dorsal view; eyes large, calabash-shaped in lateral view; antennal segments I and II densely covered with long setae; antennal flagellum 6- segmented; pronotum trapezoidal, distinctly divided into anterior and posterior lobes; anterior pronotal lobe elevated, longitudinally sulcate medially, and rounded at anterior angles; and scutellum nearly triangular, obtuse at apex.