Genus Madecorphnus Paulian, 1992
Type species: Drepanognathus falciger Lansberge, 1886, original designation.
Body small-sized (4.5–5.0 mm) with mostly uniform, brown to black coloration. Upper side of body with a few setae having distinct locations: 1 seta on elytral base near epipleuron, 1 seta on posterior angle of pronotum, 1 seta approximately in the middle of lateral margin of pronotum, 2 setae on the anterior angle of pronotum, 2 setae on each gena, and 2 setae on the anterior margin of clypeus. Mandibles asymmetrical, subequal in length in females and subequal to strongly unequal in males. Clypeus symmetrical to asymmetrical in males, wide, bordered anteriorly, smooth, without tubercles or ridges. Pronotum wider than long, smooth, similar in both sexes, without any depressions, tubercles, or ridges. Propleurae smoothly convex, without carinae separating anterolateral areas from basal area. Scutellum triangular, narrowly rounded apically, about 1/10 length of elytra. Elytra convex, with feebly marked humeral umbones, smooth, with only first stria distinct. Wings fully developed. Metepisternon triangular, tapering caudally, with slightly widened anterodorsal angle slightly overlapping epypleuron. Anterior tibiae with 3 outer teeth and tarsus. Phallobase strongly sclerotized dorsally and with a thin membrane ventrally. Parameres relatively long, apices tapering or curved downwards, without setae. Internal sac of aedeagus with species specific armature.
Species composition. The most speciose genus of Madagascan Orphninae: 19 species are known.
Distribution. Endemic to Madagascar. Species are distributed throughout Madagascar but mostly in the eastern part of the island. The notable exception is M. falculoides which was found in the western part. The majority of the localities agree well with current distribution of remnants of indigenous forests.
Frolov, A. V. (2012) Three new species of scarab beetle genus Madecorphnus Paulian, 1992 (Coleoptera: Scarabaeidae: Orphninae) from Madagascar. Proceedings of the Zoological Institute RAS, 316, 159–165.
Paulian, R. (1992) Un nouveau genre et une nouvelle espèce d'Orphnidae de Madagascar (Coleoptera, Scarabaeoidea). Revue Française d'Entomologie (N.S.), 14, 169-171.