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Key to genera of the tribe Opsiini from Arabian Peninsula (based on males) (Modified from Emeljanov 1964; Knight, 1970; Zahniser & Dietrich, 2008 and Wu et al., 2010) 1. Mesal margin of eye notched; aedeagus with one apically bifurcated shaft......................................... 2 - Mesal margin of eye entire; shafts of aedeagus separated throughout their extent.................................... 3 2. (1) Crown convex, narrowly rounded to face; pygofer without appendage............................. Neoaliturus Distant - Crown concave, distinctly angularly curved to face; pygofer with appendage........................ Concavifer Dlabola 3. (1’) Forewing with dark brown border to medial spot of approximately constant width.................................. 4 - Forewing without dark brown spots........................................................................ 5 4. (3) Aedeagus with shafts directed posteriorly at base and curving dorsally; atrium not extending ventrad of shafts.................................................................................................. Hishimonus Ishihara - Aedeagus with shafts directed ventroposteriorly at base and curving dorsally; atrium extending ventrad of shafts.................................................................................................... Naevus Knight 5. (3’) Aedeagus without basal process, branches arising separately from socle......................................... 6 - Aedeagus with pair of ventral basal processes arising from socle............................................... 8 6. (5) Vertex, pronotum and scutellum with distinctive irregular red markings; forewing with scattered small dark brown spots.......................................................................................... Masiripius Dlabola - Vertex, pronotum, scutellum and forewing with dark-brown vermiculate lines...................................... 7 7. (6’) Aedeagus with parallel or diverging or slightly converging branches, apices of branches narrowly produced, neither reflexed nor hooked............................................................................... Orosius Distant (Aedeagus with apices of branches with hooked process in Pacific distributed genus Nesophrosyne (Kirkaldy)) - Aedeagus with diverging branches bent inwards at mid-length, apices of branches distinctively curved or reflexed to form dis- tinctive tips........................................................................... Paraorosius gen. n. 8. (5’) Anterior margin of head rounded, never with carina or ridge.......................................... Opsius Fieber - Anterior margin of head sharply angulate, with distinct transverse carina.......................... Phlepsopsius Dlabola |
