Anterhynchium ( Anterhynchium ) punctatum Nguyen, 2015

Dang, Hoa Thi, Tran, Duong Dinh, Nguyen, Anh Duc & Nguyen, Lien Thi Phuong, 2025, Review of the genus Anterhynchium de Saussure (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with the description of a new species and a key to the Oriental species, Zootaxa 5716 (4), pp. 541-557 : 544

Anterhynchium ( Anterhynchium) punctatum Nguyen, 2015

( Figs 2 , 7B )

Anterhynchium ( Anterhynchium) punctatum Nguyen, 2015: 133 , female. Holotype, female, “ Hoa Binh ” [ Hoa Binh Province of Vietnam], deposited in IEBR, examined.

Diagnosis. This species can be differentiated from other congeners in the subgenus Anterhynchium by the following combination of characteristics: terga I–II cover with small and deep punctures, interspaces between punctures larger than puncture diameter; female clypeus as wide as long, with week punctures; male clypeus 1.1 × as wide as high, mandible with two distinct teeth on inner side, basal tooth shallowly emarginate at inner margin; digitus almost trapezoidal apically, with lateral margins almost straight, with dense and long setae on its surface and left margin and several short setae on right margin near apex; penis valve in profile with apical part strongly produced into a triangle lobe; metasomal segment I black, segments II–VII reddish-brown.

Description of male genitalia ( Figs 2A–E ). Genitalia were taken from specimens from Lao Cai. Tergum VIII widest near middle lengh, about 2.1 × as long as wide (at widest part), and narrow part at apex long (about 0.2 × its length) ( Fig. 2A ). Parameral spine without setae. Volsella flattened, spatulate, wide on inner aspect, and without setae at top ( Fig. 2B ). Digitus almost trapezoidal apically, with lateral margins almost straight, with dense and long setae on its surface and left margin and several short setae on right margin near apex, about 3.0 × as long as wide (at widest part) ( Fig. 2C ). Penis valve long ( Figs 2D, E ), about 1.2× as long as basal apodeme, in profile apical part strongly produced into a triangle lobe ( Fig. 2E ); middle rod shorter than basal apodeme.

Material examined. VIETNAM. Cao Bang: 1 ♀, Ha Quang, Truong Ha, 22°56’51.3”N, 106°2’21.7”E, 263 m, 13, 14.vii.2025 , L.T.P. Nguyen, H.T. Dang, C.V. Duong & A.D. Nguyen; Lao Cai: 2 ♂, Bat Xat, Ban Vuoc, 22°34’48”N 104°49’22”E, 293 m, 2.IX.2020 , L.T.P. Nguyen, C.Q. Nguyen ( one specimens with male genitalia dissected); Son La : 1 ♂, To Hieu, 7.X.2000, X.L.; Bac Giang: 1 ♂, Khe Ro Natural Reserve , An Lac, Son Dong, 5.VI.2014 , L.T.P. Nguyen et al; Hoa Binh: 1 ♂, Kim Boi, Ha Bi, Mo Da, 2–14.VI.2019 , C.Q. Nguyen; 1 ♂, Da Phuc, Yen Thuy, 27.VII.2000, X.L. Truong; Ninh Binh: 1 ♂, Cuc Phuong NP, 8.V.2002 , V.T. Hoang; Dak Lak: 3 ♂, Yok Don NP, Buon Don, 12°52’19”N 107°48’25”E, 190 m, 9.VI.2013 , L.T.P. Nguyen (all deposited in IB) .

Distribution. Vietnam ( Cao Bang *, Lao Cai *, Lang Son, Son La, Hoa Binh, Ninh Binh).

Figures

FIGURE 2. Anterhynchium punctatum, male, genitalia. A. Sternum VIII. B. Inner aspect of paramere with volsella and digitus. C. Digitus. D. Aedeagus, ventral view. E. Aedeagus, lateral view. Scale bar = 1 mm.

FIGURE 7. Anterhynchium spp., males, head, frontalview.A. A.mellyi. B. A.punctatum. C. A.flavolineatum. D.A.conformalum sp. nov. (paratype) Scale bar = 1mm.