Illustrated key to the genera included in the tribe Acanthocephalini (Hemiptera Heteroptera: Coreidae: Coreinae), with descriptions of three new genera, seven new species, new taxonomic rearrangements, and a key to genera of Placoscelini Author Brailovsky, Harry text Zootaxa 2021 2021-12-21 5082 5 457 475 journal article 2716 10.11646/zootaxa.5082.5.4 3fa676b0-872a-41c6-85ea-dacfab4e216a 1175-5326 5794957 D46E05BA-53A9-4284-984D-F85477D1998C Key to the known genera of Placoscelini * *Modifided from Brailovsky and Barrera 2012 . 1 Hind tibiae simple, not expanded......................................................................... 2 - Hind tibiae expanded.................................................................................. 3 2 Ocellar tubercle raised; inner face of male hind tibiae armed with two rows of stout spines; postocular tubercle exposed; body surface with bluish green reflections; posteroventral edge of male genital capsule with median, large, and bifid plate................................................................................... Bermejanus Brailovsky, 2018 - Ocellar tubercle flat; inner face of male hind tibiae unarmed; postocular tubercle tiny exposed; body surface without bluish green reflections; posteroventral edge of male genital capsule simple, rounded or broadly truncate, and with or without median notch............................................................................... Nyttum Spinola, 1837 3 Hind tibiae expanded into a long, thin, narrow plate covering ¾ of the total length of the tibiae; inner expansion of hind tibiae strongly spined in males of some species; outer expansion of hind tibiae never scalloped; head dorsally slightly convex above eyes; eyes in lateral view below dorsal surface of head..................................... Plaxiscelis Spinola, 1837 - Hind tibiae with foliaceous expansion; inner expansion of hind tibiae never spined; outer expansion of hind tibiae scalloped; head dorsally flat; eyes in lateral view at same the level or above the dorsal surface of head.......................... 4 4 Head with neck transversely black; pronotal disc and scutellar disc without yellowish orange or dark yellow longitudinal medial stripe; rostral segment IV the longest; callar region raised, and impunctate; corial veins not uniformly yellow; pro-, meso-, and metapleura impunctate, except the posterior margin with finest punctuation............... Stenoscelidea Westwood, 1842 - Head with neck transversely yellow to yellowish orange, except for two broad longitudinal black stripes running lateral to mid line; pronotal disc and scutellar disc with yellowish orange to dark yellow longitudinal medial stripe; rostral segment I the longest; callar region almost flat, finely punctate and with few low tubercles; corial veins yellow; pro-, meso-, and metapleura densely and deeply punctate.............................................. Stenoeurilla Brailovsky & Barrera, 2012