Limnebius labratus Perkins 2017, new species

Limnebius labratus, new species

Figs. 146 (habitus), 156 (aedeagus), 296 (map)

Type Material. Holotype (male): Toamasina, Maroantsetra, 15° 26' S, 49° 44' E, 1 i–30 xii 1955, J. Vadon (1 MNHN). Paratypes: Same data as holotype (78 MNHN).

Differential Diagnosis. Habitus as in Fig. 146; a moderately small species with elongate oval body form that is only moderately convex. The habitus is similar to that of L. lobatus, which is larger (ca. 0.86 vs. 0.93 mm), and the dorsal color is similar to L. balkei. Males have a unique raised ridge on the labrum (Fig. 146). The aedeagus is elongate, very slender, and sinuate. Also see the differential diagnosis of L. bergsteni.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 0.86/0.43; head width 0.36; pronotum 0.20/0.43; elytra 0.52/0.43; approximate height, lateral view 0.28. Dorsum with head and elytra dark brown, pronotum with ill-defined semi-circular dark brown macula surrounded laterally and posterior with light brown. Body form distinctively drop-shaped. Pronotum with disc shining, non-microreticulate, very sparsely finely punctulate, each puncture with very short adpressed seta; area posterior to eye (side view) with slightly larger punctures, each puncture with adpressed seta, longer than setae on disc. Elytra non-microreticulate or very weakly effacedly so, with punctures and setae similar to those on pronotum.

Males with first three pro- and mesotarsal segments slightly enlarged, with adhesive setae. Labroclypeal suture arcuate in frontal view in both sexes. The labrum of males has a raised transverse ridge. Lateral angle of elytral apices more widely rounded and apices more truncate in males than in females, sutural angle more acute in females.

Etymology. Named in reference to the modified male labrum.