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 angusticeps Arrow, 1941 Figs 22 , 100 , 200 , 289 , 362, 455, 576–578 Type material Holotype INDONESIA • ♂ ; “ Type [p, label circular, red frame] // DUTCH NEW GUINEA : Humboldt Bay Dist. Bewani Mts. 400 meters. Vii.1937 [p] // W.Süber. B.M.1938-177. [p]// Maechidius angusticeps Arrow type [h]”; BMNH . Description Dorsum and venter uniformly black-brown, labroclypeus castaneous brown. Male labroclypeus broadly emarginate, anterolateral angles obtuse angulate, protruding anteriad ( Fig. 100 ), its lateral margins strongly sinuous in lateral view. Punctures of frons ovoid, deep. Setae inconspicuous, scale-like, narrow and short (not or hardly surpassing length of corresponding punctures), each seta rises from anterior margin of corresponding puncture. Lateral margin of pronotum broadly rounded, shallowly emarginate prebasally, delicately crenulate all along ( Fig. 200 ). Appressed scale-like clavate seta present between every two crenulae. Lateral margin of pronotum sinuous in lateral view. Hypomeron sinuous, long setose opposite to compound eye, flange-like. Antennal pocket deep. Punctures larger and deeper than those on head. Intervening spaces glossy, narrow, wrinkled. All setae much shorter than corresponding punctures, each seta rises from anterior margin of corresponding puncture. Basal margin laterally with fringe of longer clavate scale-like setae. Lateral margins, antero- and posterolateral angles completely covered with microscopical velvety pubescence. Punctures of elytra ovoid, irregular in size, less deep than those on forebody ( Fig. 289 ). Elytral setae generally very short (only few setae are as long as corresponding punctures), each seta rises from anterior margin of corresponding puncture. Most of punctures partly or completely encircled by delicate and extremely short velvety pubescence, composing circular to subcircular patterns around perimeter of punctures. Male pygidium slightly convex dorsally, with dense ovoid deep punctures and suberect scale-like clavate setae not or hardly surpassing length of corresponding punctures ( Fig. 455 ). Male protibia with flat dorsal carina and two distal teeth on external margin (Fig. 362). Male upper metatibial terminal spur longer than half length of male basal metatarsomere, surpassing distal margin of metatibia in dorsal view. Male aedeagus as in Figs 576–578 . Sexual dimorphism Female is unknown.