Pterostichus tamdaoensis, 2023

Fedorenko, D. N., 2023, A review of Pterostichus subgenus Orientostichus (Coleoptera: Carabidae: Pterostichini) from Indochina, with description of new species, Russian Entomological Journal 32 (2), pp. 155-170 : 170

8. Pterostichus (Orientostichus)

tamdaoensis Fedorenko , sp.n.

Fig. 9 .

MATERIAL. Holotype ♀ ( ZIN), labelled: ‘Вьетнам, Там- Дао./ 8-13 IV 986/ Горохов’ [ Vietnam, Tam Dao / 1986/ Gorokhov].

DIAGNOSIS. A large-sized species of the lesticoides - group, scarcely different from the previous species in the following character combination: head slightly smaller relative to elytral width, EW/HW 2.1 (vs. 2.0); pronotal lateral bead barely narrower in basal half; basolateral sulci more shallow, outer ones vague; elytral striae, especially marginal one, very finely yet distinctly punctate.

DESCRIPTION. As for P. laevistriatus sp.n. except as follows: BL 22 mm. Body with rubbed integuments ( Fig. 9 ). Head: Frontal sulci fine and rather shallow, impunctate, diverging, almost reaching the level of anterior supra-ocular seta. Antennae about reaching pronotal basal margin. AR 1.52: 0.69: 0.97.

Pronotum broadest just behind middle, PLw/PL 0.53, with inner basolateral sulci barely diverging, outer ones very shallow; area between them flat and impunctate. Base smooth. Elytra elliptic, with apices rounded combined. Base oblique. Stria 7 opposite very obtuse humeral angle. Intervals convex, very so toward lateral margin and toward apex; striae 1–4 slightly convex on disc; 7, 5, 3 and 2 confluent apicad in succession separate from the others. Interval 3 with seta d3 adjoining stria 2 (and duplicate on right elytron), D3/EL 0.30–0.31/0.22. Stria 7 bisetose at apex, posterior seta close to apex. USS: 31–32. Reflexed lateral margin more uneven, with posterior carina vague, due to stria 9 being conspicuously punctate; microsculpture distinct, isodiametric.

Ventral side smooth, with vague punctures just outside sternopleural suture; sides of meso- and metathorax finely and densely punctate; abdominal sternites II–III with similar yet very shallow punctures. Prosternal process in ventral view rounded apically, not beaded, in lateral view rectangular and apically rounded. Metepisternum short, est3L/W 0.70.

Legs: apical 1/3 fe 2 with three anterodorsal setae, distal two proximate.

DISTRIBUTION. Known from the type locality only.

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

HABITATS AND HABITS. No data.

Acknowledgements. I am indebted to Dr. Max Barclay (NHML) and Dr. Boris Kataev (ZIN) for the loan of material under their care.

Figures

Figs 7–9.Dorsal habitus:7 — P. pseudolesticoides sp.n., paratype ♀; 8 — P. laevistriatus sp.n., holotype; 9 — P. tamdaoensis sp.n., holotype. Рис. 7–9. Габитус дорЗально: 7 — P. pseudolesticoides sp.n., paratype ♀; 8 — P. laevistriatus sp.n., голотип; 9 — P. tamdaoensis sp.n., голотип.