Figs 5, 10, 15, 20

MATERIAL EXAMINED. Vietnam: Lao Cai Prov., forest near Sa Pa, h = 1358 m, 22.33286 oN 103.84096 oE, 22.04.2019, 1♂, leg. A. Prosvirov; Lao Cai Prov., 1 km W Tram Ton Mnt Pass, 22.37055 oN 103.87350 oE, 04.05.2019, 1♀, leg. A. Prosvirov; Lao Cai Prov., near Sa Pa, Cat Cat River, h = 1323 m, 22.33395 oN 103.82281 oE, 20.04.2019, 1♀, leg. A. Prosvirov; ibid, h = 1236 m, 22.333 oN 103.84577 oE, 08.05.2019, 1♀, leg. A. Prosvirov (all MSPU).

NOTES. This species was described based on a few specimens from Shan State in Myanmar and Chinese Province Yunnan (Naviaux, 2008). Among its allies from Vietnam that share a bicoloured labrum (Figs 8–12), N. restricta is recognizable well by the pronotum conical, with subrectilinear sides (Figs 5, 15 vs. Figs 3, 4, 6, 7, 13, 14, 16, 17), the aedeagus slender at base, with very short and straight endophallic flagellum (Fig. 20 vs. Figs 18, 19, 21, 22). This is the first record of the species in Vietnam.