4. Eustra dalatensis Fedorenko, sp.n.

Figs 5, 24–25, 29, 41–42.

MATERIAL. Holotype ♂ (ZMMU) labelled: ‘ Vietnam, Dak Lak Prov [ince]., Chu Yang Sin Nat [io]n[al]. Park, 12º23´48´´N 108º20´59´´E, upper flow of Krong Kmar riv[er], h= 1000 m, 30.III– 14.IV.2012, D.Fedorenko leg. ’ Paratype ♀ (SIEE): ‘S[outhern] Vietnam, Lam Dong Prov [ince]., Bi Doup — Nui Ba Nat [ure]. Res [erve]., env. Long Lanh, 12º10´44´´N / 108º40´44´´E, h= 1400–1600 m, 30.IV.2009, leg. D.Fedorenko’ .

DESCRIPTION. Very similar to the previous species except as follows: BL 3.5–3.7 mm, body (Fig. 5) very shiny, elytral spots smaller, extending from middle to 4/5 elytra. Labrum and elytral base with distinct microsculpture, otherwise dorsal microsculpture missing, being very superficial on clypeus, anterior part of frons, and neck; elytral aciculate microsculpture outside and partly including glabrous submarginal area. Pronotum glabrous except a few setae along apex.

Head: neck constriction moderately deep, vertex moderately convex, Supra-ocular carina very fine above eye, obliterate before and behind, hardly separable from dense longitudinal wrinkles on each side; genae nearly even and straight. Labrum truncate apically. Antennomeres 5–10 barely transverse, nearly as long as wide.

Pronotum: PW / PL 1.50–1.57, PW / HW 1.06–1.14, PLw / PL 0.21–0.25, PB /PA 0.88–0.93, sides sinuate behind apical angles, sides of base subsinuate; apex sinuate; lateral edge nearly smooth, with 1–2 subtle denticles before almost right basal angles.

Elytra longer and barely dilated apicad, EL / EW 1.42– 1.45, EW / PW 1.67–1.77; sides slightly and evenly rounded. USS consisting of 11-12+4+5 setae.

Legs. Mesotarsomere 1 distinctly longer than mesotarsomere 5 while distinctly shorter than mesotarsomeres 2–4 combined, TF2 1.17–1.33: 1.36–1.50; TF3 1.54–1.86: 1.46–1.71.

Aedeagus (Figs 24–25, 29, 41–42): median lobe large, with apex toothed; right paramere distinctly longer than the left one, being in form of a straight razor. Internal sac with large spiniform apical sclerites.

DIAGNOSIS. Distinctive from E. posteroguttata sp.n. chiefly in having much less convex vertex, glabrous pronotum, smaller elytral spots, and less distinct dorsal microsculpture, in addition to very distinctive aedeagus.

DISTRIBUTION. Known from two localities in the Dalat Plateau, Southern Vietnam.

NAME. Toponymic, referring to the type locality of the species.

HABITATS AND HABITS. As described for the genus, except at higher elevations.