The Oriental Melolontha guttigera species group is revised with synopsis, a key to species, description of a new species, redescriptions of known species, remarks, illustrations, and distribution map, The guttigera species group is the only representative of the genus with its distribution extending southward from the eastern Himalayas to Indochina and crossing the equator to Java. Five species are known in this group, including a new species, M. setifera, from Myanmar. Lectotypes are designated for Melolontha guttigera Sharp and Melolontha weyersi Brenske. A key for the East and South-East Asian species group of the genus is provided, An annotated checklist of Melolontha species recorded in the region is updated in which several nomenclatural changes are proposed as follows: Hoplosternus carinata Brenske, Hoplosternus malaccensis Moser, Hoplosternus incana Motschulsky, and Hoplosternus shanghaiana Brenske are transferred to Melolontha; Melolontha fuliginosa Fairmaire and Melolontha laticauda Bates are transferred to Exolontha; Hoplosternus laevipennis Blanchard is transferred to Tocama; Hoplosternus heydeni Moser n. syn. = Melolontha chinensis (Guérin-Méneville); Melolontha nitidicollis Blanchard n. syn. = Melolontha indica Hope; Hoplosternus bifurcatus Brenske n. syn. = Melolontha furcienanda Ancey; Melolontha albidiventris Fairmaire n. syn. = Tocama rubiginosa (Fairmaire); Hoplesternus squamulatus Frey n. syn. = Tocama laevipennis (Blanchard); Melolontha hualiensis Kobayashi et Chou n. syn. = Melolontha minima Kobayashi.