Menomadraena fisheri, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 180-181

Menomadraena fisheri , new species

Figs. 171 (habitus), 173 (aedeagus), 299 (map)

Type Material. Holotype (male): Toliara, Enakara (11 km NW), Res. Andohahela, rainforest, winkler extraction of sifted litter (leaf mold, rotten wood), FMHD #92 -163, elev. 800 m, 24° 34' S, 46° 49' E, 17 xi 1992, B. L. Fisher (492) (FMNH).

Differential Diagnosis. Similar to M. ivohibe in having a long midlongitudinal depression of the metaventrite; differing therefrom in having less arcuate sides of the elytra, less convex dorsum, and less apparently granules of the elytral punctures. Some structures the aedeagi also indicate a relationship of the two species, but the aedeagus of M. fisheri is much less robust, especially the basal part of the main piece, and the distal pieces markedly differ in the two species ( Figs. 172, 173).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.79/0.79; head width 0.51; pronotum 0.39/0.68, PA 0.57, PB 0.57; elytra 1.16/0.79.

Dark brown to dark reddish brown, maxillary palpi light brown.

Maxillary palpi short, last palpomere distinctly shorter than first antennomere. Last antennomere longer and wider 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, flat or slightly rounded granules, those on frons much larger and denser, contiguous; setae very small and inconspicuous.

Pronotal disc with contiguous flat circular 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) terminating at ca. posterior ¾, second arcuate and continiuing to apices, third terminating at ca. midlength. 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. Area between third costa and explanate margin with five very irregular rows of punctures.

Mentum punctate and pubescent; postmentum sparsely pubescent, shining. Genae microreticulate, dull, without posterior ridge. Mesoventrite with very low tubercle on intercoxal process. Metaventrite virtually nonpubescent; disc almost flat, finely microreticulate and weakly shining, with shallow midlongitudinal sulcus; lateral areas dull, very finely microreticulate ( Fig. 171). 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 honor of the collector, Brian L. Fisher.