An overview on the genus Amiserica Nomura, 1974 (Coleoptera: Scarabaeidae: Melolonthinae: Sericini) Author Ahrens, Dirk 0000-0003-3524-7153 ahrens.dirk_col@gmx.de Author Liu, Wangang 0000-0003-3524-7153 ahrens.dirk_col@gmx.de Author Pham, Phu Van 0000-0001-9369-6649 phupham.iebr@gmail.com Author Fabrizi, Silvia 0000-0003-3524-7153 ahrens.dirk_col@gmx.de text Zootaxa 2021 2021-10-11 5050 1 1 63 http://dx.doi.org/10.11646/zootaxa.5050.1.1 journal article 3968 10.11646/zootaxa.5050.1.1 81282108-3550-4a28-83ca-15bb5b23881a 1175-5326 5560512 C0BF369D-F7CB-4139-A466-21E402A119B9 Amiserica costulata (Frey) group Checklist of the species: Amiserica breviflabellata Ahrens, 2004 a: 136 . Amiserica costulata (Frey, 1969) : 518 ( Lasioserica ). Amiserica krausei Ahrens, 2004 a: 130 . Amiserica longiflabellata Ahrens, 2004 a: 134 . Amiserica patibilis Ahrens, 2004 a: 137 . Amiserica recurva Ahrens & Fabrizi, 2009b: 258 . Amiserica surda Ahrens, 2004 a: 139 . Amiserica taplejungensis Ahrens, 2004 a: 133 . Key to species of the Amiserica costulata (Frey) group ( ♂♂ ) 1 Metasternum caudally strongly elevated, medially concave; with concavity very finely and densely punctate and densely erectly setose. Serrated line of metatibia widely interrupted and incomplete........................................... 2 - Metasternum caudally flat, not elevated, median concavity longitudinal and weak, not more densely punctate than the rest of the metasternum. Serrated line of metatibia complete......................................................... 5 2 Lateral margins of pronotum strongly curved. Left paramere strongly widened, interiorly with a sharp tooth........................................................................................ A. taplejungensis Ahrens, 2004 - Lateral margins of pronotum moderately curved. Left paramere narrow, interiorly without tooth....................... 3 3 Left paramere strongly shortened, its basal lobe wider; basal lobe of right paramere distinctly longer.................................................................................................... A. krausei Ahrens, 2004 - Left paramere at maximum only little shorter than the right one, its basal lobe narrower; basal lobe of right paramere distinctly shorter.............................................................................................. 4 4 Left paramere nearly subequal in length to the right one........................... A. recurva Ahrens & Fabrizi, 2009 - Left paramere little shorter than the right one............................................ A. costulata (Frey, 1969) 5 Protarsal claws symmetrical. Antennal club much longer than remaining antennomeres combined................................................................................................ A. longiflabellata Ahrens, 2004 - Protarsal claws asymmetrical, interior claw hook-like developed. Antennal club not longer than remaining antennomeres combined............................................................................................... 6 6 Anterior margin of labroclypeus not reflexed, its anterior angles strongly rounded, anterior margin slightly concavely sinuate medially................................................................... A. breviflabellata Ahrens, 2004 - Anterior margin of labroclypeus strongly reflexed........................................................... 7 7 Eyes larger (ratio diameter/interocular width: 0.88). Anterior margin of labroclypeus separated by an indistinct incision from the lateral margin of clypeus. Parameres shorter and wider................................... A. surda Ahrens, 2004 - Eyes smaller (ratio diameter/interocular width: 0.67). Anterior margin of labroclypeus separated by a distinct incision from the lateral margin of clypeus. Parameres narrow and long..................................... A. patibilis Ahrens, 2004