Pterostichus caobang Fedorenko, 2019

Fedorenko, D. N., 2019, New species of Pterostichus subgenus Circinatus (Coleoptera: Carabidae: Pterostichini) from Vietnam, Russian Entomological Journal 28 (4), pp. 358-369 : 364-366

2. Pterostichus caobang Fedorenko , sp.n.

Fig. 2 .

MATERIAL. Holotype ♀ ( ZMMU) labelled: ‘N-Vietnam, 40 km W of Cao Bang, Phia Oac Mt. , 22°36´25´´N / 105°52´08´´E, h~ 1650– 1700 m, deciduous forest, 3–11.X.2018, leg. D. Fedorenko’.

DIAGNOSIS. Distinctive in the combination of pronotum subquadrate and quadrisetose, with inner basal sulcus deep and outer basal sulcus traceable, posterolateral pronotal seta inserted in basal angle, elytron with one discal seta, humeral tooth distinct, parascutellar striole missing, and meso- and metatarsomeres 1–3 with outer carina and sulcus. Besides, mandibular scrobe without longitudinal groove.

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DESCRIPTION. Body ( Fig. 2 ), BL 11.4 mm. Pronotum and elytra slightly sericeous. Pronotal and elytral microsculpture very superficial, consisting of nearly indistinct, very small, moderately transverse meshes on pronotum and of very dense transverse lines on elytra.

Head: Frontal sulci short and shallow, parallel behind clypeus, then diverging towards anterior supra-ocular seta. Labrum truncate apically.

Pronotum rounded on sides, broadest 2/5 from apex, PW/PL 1.10, PW/HW 1.65. Base truncate, PB/PA 1.06, with slightly obtuse basal angles; apex evenly sinuate between sharp and slightly projecting angles. Disc convex and smooth, with hardly traceable basal and apical transverse impressions. Median line fine and slightly crenulate, obliterate basally and apically. Lateral bead fine, reaching posterolateral seta; apical bead fine and entire. Inner basal sulci running parallel on basal 2/5, very deep, finely, and densely to confluently, punctate at bottom, with a few punctures inside, recurved just in front of base to become much shallower yet distinct outer sulci that merge into lateral groove a fourth from base.

Elytra as in previous species, except that basal ridge is nearly straight, humeral tooth larger, basolateral bead distinct, EW/EL 1.58, EW/PW 1.27. Discal setae d2 3/5 distant from apex. USS: 16.

Underside: Mes- and metepisternum moderately and densely punctate, abdominal sternites II–IV finely punctate on sides; propleura finely and unevenly punctate along sternopleural sutures. Prosternum with a fairly deep medial groove; prosternal process with a vestigial bead (or perhaps with a secondary knob) on each side just apically, obtuse in lateral view; declivity wide and subconvex.

Legs: Metatrochanteral seta vestigial, distal metafemur bisetose.

NAME. Toponymic noun, refers to Cao Bang Province, Vietnam .

DISTRIBUTION. Known from the type locality only, Mt. Phia Oac , northern Vietnam .

HABITATS AND HABITS. As for the previous species.

Figures

Figs 1–3. Dorsal habitus: 1 — Pterostichus phiaoc sp.n., female paratype; 2 — P. caobang sp.n., holotype; 3 — P. expolitus sp.n., holotype. Рис. 1–3. Габитус дорЗально: 1 — Pterostichus phiaoc sp.n., паратип самка; 2 — P. caobang sp.n., голотип; 3 — P. expolitus sp.n., голотип.