Parevania flavofacies, Alekseev, 2025

Parevania flavofacies sp.n.

Figs 1–5 View Fig .

MATERIAL. Holotype ♂ ( Figs 1 View Fig –6) with labels: “ VIETNAM: Hoa Binh Province. Mai Chau District, Pa Co, Xa Linh , 20° 44′ N 104°55′ E; h = 1120 m. 22– 24.04.2002. S. Belokobylskij. ” “ HOLOTYPUS ♂ / Parevania flavofacies Alekseev, 2025 ”. GoogleMaps

Paratype ( 1 ♂) with labels: “ VIETNAM: Vinh Phuc Province, Tam Dao , 900 m. May 1995. A. Gorohkov. ” “ PARATYPE ♂ / Parevania flavofacies Alekseev, 2025 ” .

DESCRIPTION. Male ( holotype) ( Figs 1–5 View Fig ). Body length 8.2 mm, forewing length 7.2 mm.

Body coloring: Head black. Face below the upper quarter of the eye, clypeus and gena up to the upper quarter of the eye light yellow ( Fig. 3 View Fig ). Mandible yellow, with teeth blackish-brown ( Fig. 2 View Fig ). Maxillary and labial palpi light yellowish. Antenna light brown, with scape and first flagellomeres light brown ventrally. Mesosoma and metasoma black. Fore and mid legs light brown, except brown coxae. Hind coxa, trochanter, femur and tibia blackish-brown with bases of femur and tibia, spurs and tarsus yellow-brown. Petiole black-brown, with apex yellow-brow. Wing membrane hyaline, veins dark brown.

Head: densely pubescent with whitish hairs, finely punctate, hemispherical in lateral view and circular top view. The border between vertex and occiput is rounded. POL: OOL = 1: 1. Eye elliptical, 1,3 x high as wide. Toruli slightly lower of the mid-line of eye. Antennal sockets clearly separated. Face slightly convex. Genae smooth and shiny. Antenna 13-segmented. Scapus 2.5x as long as wide; pedicel as long as wide. Antennal segments in following proportions: 25: 8: 33: 33: 32: 29: 27: 25: 22: 22: 20: 16: 21. Mandible with three teeth.

Thorax: mesoscutum and mesoscutellum finely and sparsely punctate, with whitish hairs. Notauli complete, gradually converging at the beginning and almost parallel at the end. Metanotum irregularly foveolate. Propleuron, mesopleuron and metapleuron weakly cellular-rugose. Propodeum cellular-rugose. Distance between fore and mid coxae distinctly longer than distance between mid and hind coxae (12:5).

Hind tibia and tarsus without prominent spine. Hind femur is slightly shorter than the hind tibia. Hind inner tibial spur 0,6 × as long as first tarsomere and 2,1× as long as outer spur ( Fig. 5 View Fig ).

Forewing with 7 closed cells. Vein 1RS attached to Sc+R clearly before of the stigma ( Fig. 4 View Fig ). Hind wings with eight hamuli.

Metasoma: finely punctate, shiny, slightly longer than its height (15:11). Petiole 8.3x as long as wide.

Female. Unknown

INDIVIDUAL VARIABILITY. Paratype differs from the holotype by duller yellow coloration of the head and legs.

DIFFERENTIAL DIAGNOSIS. Among the oriental species of Evaniidae [ Deans, 2005] known to the author, the Parevania flavofacies sp.n. most resembles Zeuvevania orientalis Li et Xu [ Li, Xu, 2017] by its coloration, although morphologically they belong to different genera [ Deans et al., 2016]. However, some authors consider the genus Parevania Kieffer, 1907 as a synonym of Zeuvevania Kieffer, 1902 [ Sharanowski et al., 2019]. Apparently, this fact is an example of the multifaceted mimicry complexes that exist among Evaniidae , observed “especially in South America, where distant relatives possess similar, possibly aposematic and/or unusual color schemes of black, brown, orange, and red” [ Deans, Huben, 2003]. In addition, such yellow facial coloration is reminiscent of some wasps from genus Vespa .

As rightly noted by Deans & Huben [2003], the boundaries of ensign wasp genera have not been definitively defined yet. Probably, wing veining applied by J.-J. Kieffer [1902, 1912] as the main generic character requires revision. For example, in the collection of hymenopteres of ZIN there is a specimen from Vietnam with veining of forewings characteristic similar to that of the endemic nearctic genus Evaniella .

BIONOMICS. Biology and hosts are unknown.

DISTRIBUTION. This new species is known only from Oriental region (North Vietnam)

ETYMOLOGY. The species is named because of the unusual yellow coloration of its face (flava + facies).

Acknowledgements. The author to express our hearty thanks to his colleagues entomologists Dr. Ekaterina V. Tselikh ( ZIN, St.- Petersburg, Russia) for her help in photographing the material and Dr. Sergei A. Belokobylskij ( ZIN, St.- Petersburg, Russia) for his valuable advice .