Notes on the paper wasp genus Polistes (Polistella) (Hymenoptera: Vespidae: Polistinae) from the northern part of Vietnam with description of males and nests Author Lien, Nguyen Thi Phuong text Raffles Bulletin of Zoology 2017 2017-06-29 65 220 225 journal article 10.5281/zenodo.5355981 2345-7600 5355981 E4A73437-D6E2-4026-9C09-0CAB81657ED6 3) Polistes (Polistella ) nipponensis Pérez, 1905 Polistes nipponensis Pérez 1905: 82 , female, holotype , Yokohama , Japan (Musésum National d’Histoire Naturelle, Paris). Remarks. This species was recorded from Vinh Phuc , Hai Phong , Hoa Binh and Ninh Binh (Nguyen at al., 2011). In this study, this species is also recorded from Cao Bang , the northernmost province of Vietnam , together with its nest. Material examined. 19 females , 25 males , Phia Oac , Pha Den , Nguyen Binh , Cao Bang , 22°35′07.7″N 105°51′59.8″E , alt. 900–1100m , Nest#VN-CB-2014-P-01, 25–28.v.2014, T . V . Hoang . Nest. A nest (Nest#VN-CB-2014-P-01) ( Fig. 18 ) collected in Phia Oac NP, Cao Bang was examined. The nest was at the fully-developed stage and had a comb comprised of mainly long cells, collected together with 19 females and 15 males . Ten males emerged later when the nest was brought back to the laboratory and was being kept in a nylon bag. The nest was found under the broad leaf of a tree about 3 m above the ground. The nest characteristics are as follows: Petiole single, terminal, with thick central core of plant fibres, enlarged strictly with adult salivary secretion, black and lustrous, 4.2 mm long, 2.2 × 6.8 mm thick; salivary coating extended onto substrate and largely onto back of comb. Comb tough, pliable in texture, brown, subcircular (about 52 mm × 50 mm ) in view from side of cell opening; ventral surface convex; dorsal surface deeply concave. Nest cells generally arranged regularly and round at open end, but partly irregularly arranged, where some cells are pentagonal; cell expanded towards open end, 3.4 mm (range 2.5–4.6 mm ; n=10) wide at bottom and 5.6 mm (range 5.1–6.3 mm ; n=10) wide at open end, 14.5 mm (range 13.0–16.2) mm; n=10) deep; cell wall about 0.02 mm thick. Cocoon caps slightly domed beyond rim of cell, yellow. Distribution. China ; Japan ; Vietnam ( Nguyen et al., 2011 , present study).