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 opatroides Arrow, 1941 comb. rest. Figs 70 , 150 , 238 , 329 , 402, 498 Type material Lectotype [herewith designated] INDONESIA • ♀ ; “Type [p, label circular, red frame] // SYNTYPE [p, label circular, blue frame] // N. DUTCH NEW GUINEA: Waigeu. Camp Nok. 2,500ft. iv.1938 . L.E.Cheesman. B.M.1938-593. [p] // Coniomaechidius opatroides , Type Arrow [h]”; BMNH [the name “ Coniomaechidius ”, which appears on label, was never published]. Paralectotypes INDONESIA • 3 ♀♀ ; “ SYNTYPE [p, label circular, blue frame] // N. DUTCH NEW GUINEA : Waigeu. Camp Nok. 2,500ft. iv.1938 . L.E.Cheesman. B.M.1938-593. [p]”; BMNH . New material INDONESIA • 1 ♀ ; “N.DUTCH NEW GUINEA: Waigeu.Camp I.Mt.Nok. 2,500ft. v.1938 . L.E.Cheesman. B.M.1938-593. [p] // not a syntype [h] M. E. Bacchus det. 196[p] 9[h]”; BMNH . Remarks The lectotype is designated in order to enhance the stability of nomenclature and fix the specimen I based my redescription on. Arrow (1941: 454) described this species from four female specimens, not designating the holotype . The BMNH specimen with Arrow’s handwriting “type” is herewith designated as the lectotype . Description Dorsum densely covered with dirty yellowish microscopical velvety pubescence. Female labroclypeus ( Fig. 150 ) broadly emarginate on anterior margin, its lateral margins nearly straight in dorsal, slightly sinuous in lateral view. Anterolateral angles of labroclypeus acute, rather strongly protruding. Head dorsal punctures dense, circular to ovoid, deep. Intervening spaces generally smaller than punctures. Setae scale-like, suberect, clavate, small to rather long. Pronotum anterior and basal margins sinuous in dorsal view. Lateral margin of pronotum somewhat flattened and laterally expanding in anterior half (in dorsal view), strongly sinuous in dorsal view, broadly rounded in anterior ¾, emarginate prebasally and again widened at base. Lateral margin of pronotum nearly straight in lateral view, delicately crenulate all along ( Fig. 238 ). A scale-like curved clavate seta present between every two crenulae. Hypomeron flange-like protruding, emarginate opposite compound eye. Antennal pocket deep. Pronotal punctures elongate ovoid, deep. Intervening spaces generally larger than punctures. Lateral sides of pronotum covered with dense brush-like clusters of setae reminiscent of mammal fur ( Fig. 238 ), dorsal surface fully hidden. Setae scale-like, clavate, suberect; each seta rises from anterior margin of corresponding puncture, not surpassing its length. Elytral punctures elongate, irregularly sized and shaped, deep ( Fig. 329 ). Intervening spaces much larger than punctures. Elytral setae scale-like, clavate, appressed, not surpassing length of corresponding punctures. Longer suberect scale-like clavate setae arranged in irregular longitudinal rows – single sutural and two doubled rows. Female pygidium covered with furlike pubescence, deeply densely punctate with ovoid punctures ( Fig. 498 ). Setae of pygidium scale-like, elongate, suberect, rather long. Female protibia with two distal teeth on external margin, both nearly acute (Fig. 402). Sexual dimorphism Male is unknown.