A revision of the Maechidiini Burmeister, 1855 (Coleoptera: Scarabaeidae: Melolonthinae) from the Indo-Australian transition zone, and the first record of the tribe west of Wallace’s Line Author Telnov, Dmitry text European Journal of Taxonomy 2020 2020-10-19 721 1 210 journal article 9693 10.5852/ejt.2020.721.1127 0cd61b23-1089-4c1b-bfc0-487887abad84 4122118 89E62EF8-2E45-4C59-94B7-6A5603E8939B Maechidius papuanus Moser, 1926 Figs 62 , 156 , 240 , 273 , 331 , 404, 501–502 Type material Lectotype [herewith designated] INDONESIA • ♀ ; “Nieuw.Guinea-Expeditie 1903 [p] Etna-Bai [h] [black frame] // Maechidius papuanus Mos. Typus [h] // SYNTYPE Maechidius papuanus Moser, 1926 labelled by MFNB 2019 [p, red label]”; ZMHB . Remarks Moser (1926: 200) based his description of M. papuanus on an unstated number of specimens. The lectotype is therefore designated for the single syntype in ZMHB in order to enhance the stability of nomenclature and fix the specimen I based my redescription on, in case other syntypes are discovered in the future. Description MEASUREMENTS. Total body length 7.90 mm ( lectotype ). Body uniformly brown, labroclypeus and legs slightly paler. Head slightly wider than long, opaque dorsally, frons flattened. Female labroclypeus ( Fig. 156 ) spatulate, truncate on anterior margin, its lateral margins straight in dorsal, slightly sinuous in lateral view. Anterolateral angles of labroclypeus obtuse, on same axis as its anterior margin (not protruding). Head punctures irregularly circular, deep and dense, intervening spaces opaque, microreticulate. Head setae not present due to condition of specimen. Pronotum transverse, opaque dorsally. Anterior margin of pronotum sinuous with anterolateral angles (stronger) and median part (slightly) protruding anteriad. Basal margin of pronotum very broadly rounded. Lateral margin of pronotum in dorsal view very broadly rounded, delicately crenulate all along ( Fig. 240 ). Moderately long suberect thickened curved seta present between every two crenulae. Lateral margin of pronotum sinuous in lateral view. Hypomeron separated from prosternum by low carina, slightly arched, with long setae opposite to compound eye ( Fig. 273 ). Antennal pocket moderately deep. Pronotal punctures deep and dense, smaller and more regular circular in median third, larger and ovoid in lateral thirds. Intervening spaces generally smaller than punctures, microreticulate. Pronotal setae inconspicuous, suberect, curved; each seta rises from anterior margin of corresponding puncture, generally surpassing its length. On posterolateral and basal margins with a row of longer thicker setae. Lateral and basal margins, antero- and posterolateral angles partly covered with dense microscopical velvety pubescence. Scutellar shield narrowly rounded apically. Elytron cylindrical, opaque, with vague track of one longitudinal carina. Elytral punctures linear (elongate and narrow), incision-like, deep ( Fig. 331 ). An appressed inconspicuous seta rises from anterior margin of each puncture, generally surpassing length of corresponding incision. Intervening spaces larger than punctures, microreticulate. Female pygidium flattened dorsally, with strong glabrous median hump ( Figs 501–502 ). Area around median hump with large irregularly circular annular punctures, intervening spaces smaller than those. Setae of pygidium inconspicuous, short, suberect. Female protibia with two conspicuous distal teeth on external margin: predistal one callus-like, very inconspicuous, distal one somewhat curved inwards, obtuse (Fig. 404). Female protibial terminal spur conspicuous, very short and thick, blunt. Female metatibia widened on distal margin. Sexual dimorphism Male is unknown.