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 Key to genera and species of Japanese Tribelocephalinae 1 Interocular space narrower than eye in dorsal view; posterior pronotal lobe not sulcate along meson ( Opistoplatys )........ 2 - Interocular space wider than eye in dorsal view; posterior pronotal lobe sulcate along meson ( Abelocephala )............. 3 2 Body approximately 6.7 mm long; antennal flagellum longer than antennal segment II; posterior pronotal lobe without yellow- ish longitudinal stripe or spot along meson................................................. Opistoplatys minimus - Body approximately 7.6 mm long; antennal flagellum shorter than antennal segment II; posterior pronotal lobe with yellowish longitudinal stripe or spot along meson................................................ Opistoplatys flavolineatus 3 Head twice as long as width across eyes.................................................. Abelocephala longiceps - Head 1.5 times or less as long as width across eyes........................................................... 4 4 Body length more than 3.8 mm ; rostral segment I twice or more as long as segment II............................... 5 - Body length less than 3.6 mm ; rostral segment I 1.7 times or less as long as segment II.............................. 6 5 Mandibular plates acutely angled at anterior corner and strongly projected anteriorly in dorsal view; outer (larger) cell of hem- elytral membrane acutely angled apically; posterior process of pygophore narrow in dorsal view.. Abelocephala yaeyamensis - Mandibular plates nearly right-angled at anterior corner and weakly projected anteriorly in dorsal view; outer (larger) cell of hemelytral membrane rounded apically; posterior process of pygophore wide in dorsal view........... Abelocephala major 6 Mandibular plates acutely angled at anterior corner and strongly projected anteriorly in dorsal view; outer (larger) cell of hem- elytral membrane rounded apically; posterior process of pygophore narrow in dorsal view; lateral projections of female abdominal tergite IX long and gently constricted at middle.................................... Abelocephala nakatai - Mandibular plates nearly right-angled at anterior corner and weakly projected anteriorly in dorsal view; outer (larger) cell of hemelytral membrane acutely angled apically; posterior process of pygophore wide in dorsal view; lateral projections of female abdominal tergite IX short and not constricted at middle................................................. 7 7 Head approximately 1.4 times in male and 1.5 times in female longer than width across eyes; corial cell more or less fuscous in macropterous form; posterior process of pygophore with straight apical margin in dorsal view; valvula I with 4 setae............................................................................................ Abelocephala albula - Head approximately 1.6 times in male and 1.7 times in female longer than width across eyes; corial cell evenly pale in macropterous form; posterior process of pygophore with weakly curved apical margin in dorsal view; valvula I with 2 setae.................................................................................... Abelocephala araiorum