Metabacetus laotinus Straneo, 1938

Fedorenko, D. N., 2021, Notes on the genera Aristopus, Cosmodiscus and Metabacetus (Coleoptera: Carabidae: Pterostichini: Abacetina), with description of three new species from Vietnam, Russian Entomological Journal 30 (4), pp. 413-429 : 417

2. Metabacetus laotinus Straneo, 1938

Figs 2 , 6–7, 12, 17–18.

Straneo, 1938a: 152–153 (Xieng Khouang env., Laos); Will, Park, 2008: 194.

MATERIAL. Two specimens ( SIEE): Vietnam: ♂, Lam Dong Province, Bi Doup-Nui Ba Nature Reserve, env. Long Lanh, 12°10´44´´N / 108°40´44´´E, h= 1400–1600 m, at light, 28.IV– 10.V.2009 (D. Fedorenko); ♀, Cao Bang Province, 40 km W of Cao Bang, Phia Oac Mt. , eastern slope, h = 1600–1800 m, 22°36´27´´N / 105°52´0´´E, 22.V–6.VI.2018 (A. Abramov) .

DIAGNOSIS. As for the previous species, except that pronotal sides are straight or subconvex in front of basal angles, and lateral margin rather widely explanate and reflexed in basal half; elytral discal pore d2 small yet traceable.

REDESCRIPTION. As for the previous species except as follows: Body ( Fig. 2 ) barely smaller, BL 6.1–7.1 mm. Pronotum more widely reddish along sides. Pronotal and elytral microsculpture consisting of very dense transverse lines, indistinct on pronotal disc and almost so on neck in male.

Head barely smaller, PW/HW 1.57–1.62, frontal sulci deep and divergent to slightly S-shaped behind. Labrum apically subsinuate.

Pronotum barely narrower, PW/PL 1.23–1.28, with narrow base, PB/PA 1.17–1.26. Sides straight in basal half, explanate lateral margin moderately wide and conspicuously reflexed behind anterolateral seta. Basal margin distinctly oblique outside basal sulci; these reaching base, slightly converging apicad. Apical bead obliterated in middle fifth.

Elytra: EL/EW 1.49–1.51, EW/ PW 1.35 – 1.37 . Intervals subconvex in ♂, convex in ♀; ‘setigerous’ pore d2 minute yet traceable, adjoining or near stria 2 .

Prosternum with a vague median groove, prosternal process not apically bordered.

Aedeagus (Figs 6–7, 12, 17–18): median lobe in lateral view more sharply curved, with longitudinal median carina rather narrow and apex very thin; in ventral view fusiform, much broader at middle than at extremities.

GEOGRAPHIC DISTRIBUTION. Laos and Vietnam.

HABITATS AND HABITS. As for the genus.

Figures

Figs 1–3. Dorsal habitus of Metabacetus spp.: 1 — M. hermanni, ♂ from Xuan Son NP; 2 — M. laotinus, ♀ from Cao Bang Province; 3 — M. perakianus, ♀ from Song Thanh NP. Рис. 1–3. Габитус дорЗально Metabacetus spp.: 1 — M. hermanni, ♂ иЗ Национального парка Суансон; 2 — M. laotinus, ♀ иЗ провинции Каобанг; 3 — M. perakianus, ♀ иЗ Национального парка Сонгтхань.