Menomadraena andringitra, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 176-177

Menomadraena andringitra , new species

Figs. 167 (habitus), 169 (aedeagus), 299 (map)

Type Material. Holotype (male): Fianarantsoa, Res. Andringitra, 8.5 km SE Antanitotsy , sifted litter (leaf mold, rotten wood), montane rain forest, elev. 1990 m, 22° 10' S, 46° 58' E, 6 iii 1997, B. L. Fisher (1526) ( FMNH) . Paratypes (24): Same data as holotype (23); Fianarantsoa,Res. Andringitra, 8.5 km SE Antanitotsy, sifted litter (leaf mold, rotten wood), montane rainforest, Sylvian , elev. 1990 m, 22° 10' S, 46° 58' E, 6 iii 1997, B. L. Fisher (1524) (1 FMNH).

Differential Diagnosis. Similar to M. sembella in having a small oval posteromedian depression of the metaventrite; differing therefrom in having a more convex discal area of the metaventrite and a more convex body shape. The aedeagi of the two species show some resemblance but differ significantly in shapes of the distal part of the main piece and the parameres ( Figs. 169, 168).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.75/0.90; head width 0.52; pronotum 0.36/0.72, PA 0.58, PB 0.64; elytra 1.19/0.90. Size range ca. 1.79–2.21 mm. Dorsum, venter and legs reddish brown; maxillary palpi light brown.

Maxillary palpi short, last palpomere distinctly shorter than first antennomere. Last antennomere longer than penultimate. Labrum bilobed, pubescent, originating under overhanging anterior margin of clypeus. Subocular groove for antenna deep and wide. Clypeus anterior margin emarginate. Clypeus and frons with small, dense, flat or slightly rounded granules, those on frons much larger, usually contiguous; setae very small and inconspicuous.

Pronotal disc with contiguous flat circular or slightly oval granules; lateral explanate areas and two very small areas basally without granules, shining; shallow midlongitudinal sulcus in anterior 2/3; posteroadmedian foveae confluent with median impression in midline. Postocular emarginations deep.

Elytral suture raised. Each elytron with three costae, first (from suture) and third terminating at ca. posterior ¾, second arcuate and continiuing to apices. Each costa with unilinear row of very small granules, each with short recumbent seta. Areas between costae each with three rows of small punctures, each puncture with minute granule and seta at anterior margin, and a granule on each side of each puncture. Area between third costa and explanate margin with five slightly irregular rows of punctures.

Mentum punctate and pubescent; postmentum microreticulate, dull. Genae microreticulate, dull, without posterior ridge. Mesoventrite with very low tubercle on intercoxal process. Metaventrite virtually non-pubescent; disc almost flat, very finely microreticulate, shining, with small basomedian circular or slightly oval depression; lateral areas dull, very finely microreticulate ( Fig. 167 ). Abdominal ventrites very finely microreticulate, with very fine, very short, and exceedingly sparse setae, almost glabrous. Mesotibia straight, pro- and metatibiae slightly arcuate toward midline.

Etymology. Named in reference to the type locality.

Figures

FIGURE 167. Menomadraena andringitra, holotype, habitus dorsal, lateral, and ventral.