Lesticus bellus Fedorenko, 2022

Fedorenko, D. N., 2022, New or little-known Lesticus Dejean, 1828 (Coleoptera: Carabidae: Pterostichini) from Vietnam, Russian Entomological Journal 31 (3), pp. 260-275 : 268

4. Lesticus bellus Fedorenko , sp.n.

Figs 9 , 21 , 33–34, 36 .

MATERIAL. Holotype ♀ ( ZMMU) and paratype ♂ ( SIEE), labelled: ‘ Vietnam, Kon Tum Prov. / Kon Plong Distr.,/ 14°45´N 108°17´51´´E / env. ngok Boc 1 Mt./ h= 1300–1400 m 8–10.VI./ D.Fedorenko leg. 2016’. Two paratypes: ♀ ( MPSU), ‘ Vietnam / prov. Gialai-Contum / Bhuonloi / 9.I.1990 / leg. Ю. Зайцев [Yu. Zaitzev]’; ♀ ( ZIN), ‘ Laos, Attopeu Prov. ,/ Sesu River , 300–600 m,/ 20 II 1986./ O.N. Kabakov leg.’. — Internal sac of aedeagus examined in male.

DIAGNOSIS. A large-sized, contrastingly bicoloured species of the auricollis species group. Body apterous, metepisternum short, protarsomere 1 without (holotype) or with (paratypes) rudimentary ventral pad in female. Internal sac of aedeagus ( Figs 33–34 ) peculiar due to bulb a missing; b simple, tubiform, with apex curved slightly to the right and a little pointed; c and d narrowly separated; c divided into two, i.e., with dorsal process well separated, rather small, conical and directed to the right, instead of dorsad; e medium-sized, bifid, with both apical branches conical and strongly diverging, dorsal branch (ed) set perpendicular to aedeagus, ventral one (ev) nearly vertical.

DESCRIPTION. BL 27.8–32 mm. Dorsum shiny, bright metallic, contrastingly bicoloured, head golden green or cupreous green, pronotum golden, slightly cupreous, elytra bright violaceous, slightly less shiny in female than in male. Body otherwise black, antennae toward apices and palps brownish, apices of the latter, as well as sides of labrum reddish. Microsculpture missing or indistinct on head, with isodiametric meshes hardly traceable on sides of neck, imperceptible on pronotum, sometimes with very small, slightly transverse, rectangular meshes traceable here and there; elytral microsculpture superficial and isodiametric. Head, pronotum and elytra densely micropunctate.

Head ( Fig. 9 ): frontal sulci from long, deep, sinuous, reaching the level of posterior supra-ocular seta and diverging just in front, to short, obliterate behind anterior supra-ocular seta and reduced to a few oblique strioles just in front of posterior seta. Neck constriction shallow.

Pronotum ( Fig. 21 ) subquadrate, broadest two fifths from apex, with sides rounded and indistinctly sinuate a third from base. Base a sixth wider than apex, slightly sinuate in middle two fourths, basal angles very obtuse and blunt. Apex distinctly sinuate. Lateral bead rather narrow in apical two fifths, increasingly wide toward base, very wide in basal third. lateral groove narrow in front of anterolateral seta, increasingly wide behind and merged into basal fovea; these mostly flat and smooth. Inner basal sulci more or less converging apicad, running on basal two fifths, deep basally, less so apically, not or sparsely cross-striated. Median line moderately deep, obliterate basally and apically. Basal transverse impression missing, apical one vague.

Elytra elliptic, slightly longer, less rounded on sides, with apices slightly pointed combined, in male, wider, more round- ed on sides, with apices widely rounded combined, in female; humeri rounded or just traceable. Basal ridge inwardly reaching stria 1 or 2, or 3; humeral angle obtuse. Striae deep, finely punctate, intervals slightly convex (♂) or almost flat (♀). Interval 3 with three discal setae, d1 adjoining stria 3, d2 and d3 adjoining stria 2. USS: 26–27.

Sides of metaventrite, mes- and metepisterna and abdominal sternite II moderately punctate; propleura in apical half with less than 20 similar yet finer punctures; ventral side otherwise smooth.

Legs as for the genus. Meso- and metatarsi not laterally carinate, tarsomeres 1 and 2 with only laterovenral sulcus and sometimes with an indistinct trace of dorsolateral one. Mesofemur with 2–3 anteroventral setae.

GEOGRAPHIC DISTRIBUTION. Only known from Central Vietnam (Kon Tum Province) and adjacent part of Laos (Attapeu Province).

NAME. Latin adjective meanning bright/ beautiful/ glorious.

HABITATS AND HABITS. The holotype and paratype have been collected by pitfall trap or by hand in a montane, broad-leaved, monsoon forest.

Figures

Figs 1–12. Head: 1–2 — Lesticus nubilus, 2♂♂; 3 — L. attenuatus sp.n., ♂ paratype; 4 — L. p. praestans, ♂ from Cuc Phuong NP, Vietnam; 5 — L. p. mouhotii, ♀ from Mondulkiri Prov., Cambodia; 6 — L. auricollis, ♂ from Bac Giang Prov., Vietnam; 7–8 — L. verticillatus sp.n., ♂ paratype from Song Thanh NP and ♂ holotype; 9 — L. bellus sp.n., ♀ holotype; 10 — L. buqueti, ♀; 11 — L. lakhonus, ♀; 12 — L. laevis sp.n., ♂ holotype; 1, 10–11 — Cat Tien NP, Vietnam; 2 — Mae Vong env., Thailand. Рис. 1–12. Голова: 1–2 — Lesticus nubilus, 2♂♂; 3 — L. attenuatus sp.n., паратип ♂; 4 — L. p. praestans, ♂ иЗ Нац. парка Кыкфыонг, Вьетнам; 5 — L. p. mouhotii, ♀ иЗ пров. Мондулкири, Камбоджа; 6 — L. auricollis, ♂ иЗ пров. БакЗЯн, Вьетнам; 7–8 — L. verticillatus sp.n., паратип ♂ иЗ нац. парка Сонгтхань и голотип ♂; 9 — L. bellus sp.n., голотип ♀; 10 — L. buqueti, ♀; 11 — L. lakhonus, ♀; 12 — L. laevis sp.n., ♂ голотип; 1, 10–11 — Нац. парк Катьен, Вьетнам; 2 — окр. Мае Вонг, Таиланд.

Figs 13–24. Pronotum: 13–14 — Lesticus nubilus, 2♂♂; 15 — L. attenuatus sp.n., ♂ paratype; 16 — L. p. praestans, ♂ from Cuc Phuong NP, Vietnam; 17 — L. p. mouhotii, ♀ from Mondulkiri Prov., Cambodia; 18 — L. auricollis, ♂ from Bac Giang Prov., Vietnam; 19– 20 — L. verticillatus sp.n., ♂ paratype from Song Thanh NP and ♂ holotype; 21 — L. bellus sp.n., ♀ holotype; 22 — L. buqueti, ♀; 23 — L. lakhonus, ♀; 24 — L. laevis sp.n., ♂ holotype; 13, 22–23 — Cat Tien NP, Vietnam; 14 — Mae Vong env., Thailand. Рис. 13–24. Переднеспинка: 13–14 — Lesticus nubilus, 2♂♂; 15 — L. attenuatus sp.n., паратип ♂; 16 — L. p. praestans, ♂ иЗ Нац. парка Кыкфыонг, Вьетнам; 17 — L. p. mouhotii, ♀ иЗ пров. Мондулкири, Камбоджа; 18 — L. auricollis, ♂ иЗ пров. БакЗЯн, Вьетнам; 19–20 — L. verticillatus sp.n., паратип ♂ иЗ нац. парка Сонгтхань и голотип ♂; 21 — L. bellus sp.n., голотип ♀; 22 — L. buqueti, ♀; 23 — L. lakhonus, ♀; 24 — L. laevis sp.n., ♂ голотип; 13, 22–23 — Нац. парк Катьен, Вьетнам; 14 — окр. Мае Вонг, Таиланд.

Figs 25–39. Aedeagus: 25–26 — Lesticus praestans mouhotii; 27–28– L. nubilus; 29–30, 38–39 — L. attenuatus sp.n., paratypes; 31– 32, 35 — L. auricollis; 33–34, 36 — L. bellus sp.n., paratype; 37 — L. verticillatus sp.n., paratype; 25–34 — median lobe with everted and inflated internal sac; 25, 27, 29, 31, 33 — caudal aspect; 26, 28, 30, 32, 34 — anterodorsal aspect; 35–39 — right paramere, left aspect; a, b, bb, c, cd, d, e, ed, ev, f — bulbs of internal sac. Scale bars 2 mm (25–34) or 1 mm (35–39). Рис. 25–39. Эдеагус: 25–26 — Lesticus praestans mouhotii; 27–28– L. nubilus; 29–30, 38–39 — L. attenuatus sp.n., паратипы; 31– 32, 35 — L. auricollis; 33–34, 36 — L. bellus sp.n., паратип; 37 — L. verticillatus sp.n., паратип; 25–34 — среднЯЯ долЯ с вывернутым и надутым внутренним меШком; 25, 27, 29, 31, 33 — каудально; 26, 28, 30, 32, 34 — антеродорЗально; 35–39 — праваЯ парамера, слева; a, b, bb, c, cd, d, e, ed, ev, f — пуЗыри внутреннего меШка. МасШтаб: 2 мм (25–34) или 1 мм (35–39).