(Figures 2, 12, 23, 31)

Type material

Holotype, male. E of Lake Mantasoa, Ambohiboatavo, 1340 m, III.1973, P. Griveaud and A. Peyrieras leg (MNHN). Paratypes, two males with the same data as the holotype.

Description

Holotype. Body length 5.0 mm. Head and pronotum dark brown, elytra and legs brown.

Right mandible as long as left, without tooth basad of apex. Labrum trapezoidal, its length about 1/4–1/5 width (in dorsal view).

Clypeus symmetrical, slightly convex anteriorly, obtuse, with two long and a number of smaller setae. Genae very small, not protruding past eyes. Canthus and frontal suture indistinct. Clypeus, slightly depressed in the middle anteriorly, rather densely, irregularly punctate (punctures separated by one to three times their diameters).

Pronotum 1.8 times wider than long, widest medially. Margins with relatively wide border, lateral margins with four long setae. Pronotum evenly convex, densely, irregularly punctuate (punctures separated by one to three times their diameters anteriorly, becoming sparser basally).

Elytra convex, with distinct humeral and apical calli. Maximum width approximately at basal third. First stria distinct and reaching the apex of elytron, other striae indistinct. Epipleura with long, sparse, brown setae. Base of elytra with border from scutellum to humeral callus. Elytra sparsely punctate with relatively large punctures (more densely near suture).

Anterior tibiae with three outer teeth, lateral margin basad of outer teeth not crenulate. Apex with robust, spur-like seta and a few smaller setae basally. Middle and posterior legs similar in shape. Longer tibial spur a bit shorter than two basal tarsomeres in middle legs and a bit shorter than three tarsomeres in posterior legs.

Aedeagus. Parameres tapering apicaly, somewhat arrow-shaped, angulate laterally (Figure 12). Internal sac with three large sclerites and an area of short spinules (Figure 23).

Variation

Length of the paratypes varies from 4.5 to 5.0 mm, otherwise they are similar to the holotype.

Diagnosis

This species can be separated from other Madecorphnus species by the densely pubescent head and pronotum and by the shape of the parameres and internal sac armature.