Amphimenes (Amblops) piceus, Fedorenko, 2019

Fedorenko, D. N., 2019, A revision of Amphimenes (Coleoptera: Carabidae: Lebiini), Russian Entomological Journal 28 (3), pp. 233-250 : 240-243

The piceus species group.

2.1. Amphimenes (Amblops) piceus

( Andrewes, 1931), comb.n.

Figs 1 , 27–28 , 32 .

Andrewes, 1931: 521 ( Amblops ; Dehra Dun, North India).

MATERIAL. Two syntypes ( BMNH) : ♂ with four labels: ‘Dehra Dun, Jharipani 5,222 ft. ’, ‘Bought from Staudinger & Bang- Haas, 1930’, ‘Type’ [red], ‘ Amblops piceus , Type Andr.[hw], H.E.Andrewes det.’; ♂ mounted on back, with same labels, except for ‘Cotype’ (white circle margined with green) substituted for the fourth label. The former syntype is here designated as lectotype. Also, digital image of a syntype at https://carabidae.org.

REDESCRIPTION. Unnecessary, except for the following additions: Body ( Fig. 1 ). Pronotum broadest 0.29 times from apex, with median part of base distinctly produced and 2.67 times as wide as lateral lobes; PW/PL 1.48–1.53 (1.51, n=3), PW/HW 1.20–1.24 (1.23), PB/PA 1.37–1.40. EL/EW 1.40–1.47 (1.43), EW/PW 1.55–1.60 (1.58); D1/EL 0.24, D2/EL 0.63–0.66 (0.65), D3/EL 0.92–0.94 (0.93). Mesotibia with a minute preapical fissure instead of tubercles. Tarsomere 5 with one pair of long ventral setae in apical half.

Aedeagus ( Figs 27–28 , 32 ): median lobe in ventral view barely wider a third from base than just distal to basal bulb; apex rounded and fairly small.

DISTRIBUTION. Known from a few localities in the environs of Dehra Dun, northern India.

HABITATS AND HABITS. Andrewes [1931] reported that most of the syntypes were taken under bark, including eleven under bark of Pinus longifolia .

2.2. Amphimenes (Amblops) subcostatus

Fedorenko , sp.n.

Figs 2 , 29–30 , 34 .

MATERIAL. Holotype ♀ ( ZMMU) labelled: ‘ Vietnam, Dak Lak Province, Chu Yang Sin Nat [io]n[al]. Park, 12°25 ' 25 '' N / 108°21 ' 53 '' E, Krong Kmar riv[er]., upper flow, h= 970 m, 15– 30.V.2014 , D. Fedorenko leg.’. Paratype ♂ ( SIEE):‘ Laos, Prov [ince]. Vientiane, env. Van Vieng , 18°55 ' 12 '' N / 102°26 ' E, h=~ 230 m, at light, 7–9.XI.2015, leg. I.Melnik’ .

DESCRIPTION. Body ( Fig. 2 ) macropterous, small, BL 5.2–5.4 mm, shiny black. Mouthparts, basal four antennomeres, legs, including coxae, as well as sternum between coxae and in front of metacoxae, reddish-yellow; tibiae and tarsi indistinctly infuscated while mandibles, hypomera, reflexed margins of both pronotum and elytra barely more so; metaventrite and abdomen reddish-brown; antennomeres 5– 11 dark brown. Head and pronotum with isodiametric microsculpture, more superficial on vertex and neck, nearly granulate before, granulate along pronotal apex and base; elytra with superficial yet distinct microsculpture consisting of very transverse yet large meshes.

Head: eyes large and hemispherical; genae nearly indistinct. Posterior supra-ocular seta on a level with posterior margin of eye. Antennae short, not quite reaching basal angles of pronotum.

Pronotum quadrate, slightly transverse, PW/PL 1.49– 1.54, PW/HW 1.24–1.26, wider at base than at apex, PB/PA 1.39–1.41, broadest a third from apex. Sides rounded in apical two thirds, indistinctly angulate at and straight on each side of anterolateral seta, gently sinuate in front of basal angles, which are obtuse and rounded at tips. Base with median part convex, distinctly produced beyond and twice as wide as lateral lobes; these slightly oblique forward and rounded at basal angles; basal bead obsolete in the middle. Apex evenly concave and very finely beaded; apical angles blunt and lightly projecting forward. Disc very convex, finely and densely rugulose. Lateral margin explanate and moderately reflexed, narrow in apical half, slightly wider basad. Median line entire and deep. Both transverse impressions, basal and apical, shallow. Basal foveae small, deep and rounded. Paramedian foveae very small and nearly imperceptible.

Elytra nearly square, EL/EW 1.45–1.51, EW/PW 1.46– 1.48, broadest at middle, nearly parallel-sided in middle third, with humeri and posterolateral angles widely rounded. Apical truncature oblique and barely sinuate; extreme apices blunt. Striae deep and finely punctate; intervals convex, more so before apex. D1/EL 0.21–0.23 (0.22), D2/EL 0.60–0.64 (0.62), D3/EL 0.92–0.94 (0.93).

Metepisternum long.

Tarsomere 5 with one pair of ventral setae close to apex. In male, profemur and mesotrochanter without tubercle, mesotibia with one preapical tubercle at inner margin.

Aedeagus ( Figs 28–29 , 33 ): as in A. piceus , except for median lobe subtriangular (vs. subequally wide) in ventral view owing two a large rounded swell on left side, with apical lamella distinctly wider and a little upturned.

DIAGNOSIS. Very similar to A. piceus , being distinctive in having the elytra slightly longer and more convex, with striae deep, inner intervals convex and outer intervals very so. Aedeagus is differently shaped as well.

DISTRIBUTION. Southern Vietnam and Laos.

NAME. Refers to the convex to very convex elytral intervals.

HABITATS AND HABITS. The female specimen was taken under exfoliated bark scales of a living tree in a broad-leaved monsoon forest.

2.3. Amphimenes (Amblops) marginicollis Fedorenko, sp.n.

Figs 3 , 25–26 , 36 .

MATERIAL. Holotype ♂ ( ZMMU) and paratype ♂ ( SIEE) labelled: ‘N-Vietnam, Nghe An Prov., Que Phong Distr., Pu Hoat National Park , 19°45 ' 19 '' N / 104°47 ' 47 '' E, h= 840 m 15–27.V.2019, leg. D.Fedorenko’.

DESCRIPTION. As for the previous species, except as follows: Body ( Fig. 3 ) larger, BL 5.9–6.4 mm. Mouthparts (labrum excluded), antennae, legs, reflexed margins of both pronotum and elytra reddish yellow. Underside red within prothorax, along middle of meso- and metaventrites, with abdomen reddish medially, otherwise dark brown.

Antennae reaching basal angles of pronotum.

Pronotum large and transverse, PW/PL 1.57–1.61, PW/ HW 1.40–1.48, half wider at base than at apex, PB/PA 1.47– 1.50, broadest two thirds from apex. Sides rounded in apical three fourths, with basal basal angles nearly right and blunt. Median part of base half wider than lateral lobes. Explanate lateral margin wide in apical half and very wide in basal half. Median line entire and deep. Basal transverse impression deep, apical one shallow medially, obliterate laterally. Basal foveae small, deep and rounded. Paramedian foveae missing.

Elytra a bit more rounded on sides, EL/EW 1.44–1.48, EW/PW 1.35–1.36. Intervals convex in basal third, along sides and close to apex, otherwise inner four or five nearly flat. D1/EL 0.21–0.25 (0.23), seta d1 closer to apex, D2/EL 0.68–0.71 (0.70), D3/EL 0.93–0.95 (0.93). USS anterior (10 US) and posterior (6 US) groups setae slightly separated to almost continuous, consisting of 9+1+6 setae.

Tarsomere 5 with two pairs of ventral setae. In male, profemur with a distinct, small and blunt tubercle; mesotibia with four preapical tubercles at inner margin.

Aedeagus ( Figs 25–26 , 36 ) similar to that of A. absensacidus , except chiefly for median lobe strongly and abruptly desclerotized, i.e., membranous medioventrally.

DIAGNOSIS. Similar to A. absensacidus , except that pronotal sides are sinuate (vs. convex) in front of almost straight (vs. obtuse) basal angles, and aedeagus distinctive.

DISTRIBUTION. Northern Vietnam.

NAME. Refers to the pale and widely explanate lateral margins of the pronotum.

HABITATS AND HABITS. Both specimens were taken at night, running on trunks of smaller living trees in a broad-leaved monsoon forest.

Figures

Figs 1–5. Dorsal habitus: 1 — Amphimenes piceus, lectotype; 2 — A. subcostatus sp.n., holotype; 3 — A. marginicollis sp.n., holotype; 4 — A. ruficollis sp.n., holotype; 5 — A. similis sp.n., ♂ paratype from Kon Chu Rang NP. Рис. 1–5. Габитус дорЗально: 1 — Amphimenes piceus, лектотип; 2 — A. subcostatus sp.n., голотип; 3 — A. marginicollis sp.n., голотип; 4 — A. ruficollis sp.n., голотип; 5 — A. similis sp.n., паратип ♂ иЗ национального парка Контюранг.

Figs 21–30. Median lobe of aedeagus: 21–22 — Amphimenes konplongensis sp.n.; 23–24 — A. bicoloripes sp.n.; 25–26 — A. marginicollis sp.n.; 27–28 — A. piceus; 29–30 — A. subcostatus sp.n.; 21, 23, 25, 27, 29 — left aspect; 22, 24, 26, 28, 30 — right aspect. Scale bar: 0.5 mm. Рис. 21–30. СреднЯЯ долЯ Эдеагуса: 21–22 — Amphimenes konplongensis sp.n.; 23–24 — A. bicoloripes sp.n.; 25–26 — A. marginicollis sp.n.; 27–28 — A. piceus; 29–30 — A. subcostatus sp.n.; 21, 23, 25, 27, 29 — слева; 22, 24, 26, 28, 30 — справа. МасШтаб: 0,5 мм.

Figs 31–38. Median lobe of aedeagus, ventral aspect: 31 — Amphimenes acutipennis sp.n.; 32 — A. piceus; 33 — A. basipunctatus sp.n.; 34 — A. subcostatus sp.n.; 35 — A. femoralis sp.n.; 36 — A. marginicollis sp.n.; 37 — A. bicoloripes sp.n.; 38 — A. konplongensis sp.n. Scale bars: 0.5 mm. Рис. 31–38. СреднЯЯ долЯ Эдеагуса, вентрально: 31 — Amphimenes acutipennis sp.n.; 32 — A. piceus; 33 — A. basipunctatus sp.n.; 34 — A. subcostatus sp.n.; 35 — A. femoralis sp.n.; 36 — A. marginicollis sp.n.; 37 — A. bicoloripes sp.n.; 38 — A. konplongensis sp.n. МасШтаб: 0,5 мм.