Nazeris dinggyensis sp. n.

Figs 1B, 2B, 4A–G, 10H

Type material. Holotype: CHINA: male, ‘ China: Xizang, Dinggyê County, pass to Zhêntang Town, 27°53′58″N, 87°27′21″E, 3060 m, 28.vi.2021, Peng, Yin & Zhang leg. (ƱAEṪDZƂḴaefflẅøṁ⁂ḩ)’ (SNUC) . Paratypes: 2 males, 1 female, same data as holotype; 1 female, same data, except ‘ Zhêntang Town, Xiuxiongma Vill., 27°54′11″N, 87°22′42″E, 2700–3000 m, 25.vi.2021. (ƱAEƋṞflṪDZƂḴaeaeffǿLjn') ’.

Diagnosis. Body reddish brown to dark brown; head with non-umbilicate punctation, shaped like sunflower seed; abdominal tergites lacking microsculpture; aedeagal ventral process distinctly narrowed near apical third in ventral view; dorso-lateral apophyses with wide apex in ventral view, not reaching apex of ventral process.

Description. Body length 6.2–6.4 mm; forebody length 3.3–3.4 mm.

Body (Fig. 1B) reddish brown to dark brown; antennae and legs yellowish brown.

Head (Fig. 2B) 1.05–1.11 times as long as wide; punctation very dense, moderately coarse and non-umbilicate, shaped like sunflower seed; interstices lacking microsculpture; postocular portion 2.2–2.3 times as long as eye length.

Pronotum (Fig. 2B) 1.15–1.24 times as long as wide, 0.90–0.95 times as long and 0.80–0.87 times as broad as head; punctation non-umbilicate, moderately dense, slightly coarser than that of head; midline posteriorly with very short and narrow impunctate elevation; interstices lacking microsculpture.

Elytra (Fig. 2B) 0.65–0.72 times as long as wide, 0.56–0.65 times as long and 1.01–1.07 times as broad as pronotum; punctation similar to that of pronotum; interstices lacking microsculpture.

Abdomen (Fig. 1B) with punctation dense and rather coarse on tergites III–IV, dense and less coarse on tergites V–VI, moderately dense and fine on tergites VII–VIII; interstices lacking microsculpture (Fig. 4A).

Male. Sternite VII (Fig. 4B) with posterior margin shallowly concaved in the middle. Sternite VIII (Fig. 4C) with V-shaped posterior excision. Aedeagus (Figs 4D–G) weakly sclerotized; ventral process distinctly narrowed near apical third in ventral view; dorso-lateral apophyses slender, with wide apex in ventral view, not reaching apex of ventral process.

Distribution and habitat data. The species in known only from Dinggyê County in southern Xizang (Fig. 10H). The specimen was collected by sifting leaf litter at attitudes of 2700–3060 m.

Comparative notes. The new species is very similar to N. mirabilis in general appearance, especially the punctation of head, but can be separated by abdominal tergites lacking microsculpture (Fig. 4A) and distinctly slender ventral process of aedeagus in ventral view (Figs 4D, E).

Etymology. The specific epithet is derived from the name of the type locality: Dinggyê.