Euxaldar jehucal Fennah, 1978, by monotypy.

Body hemispherical, head including eyes wider than pronotum. Metope flat and elongate. Coryphe transverse, 2-3 times as wide as long. Fore wings elongate and wide, without hypocostal plate; venation poorly recognizable. Hind wings one-lobed, rudimentary, much shorter than fore wings. Hind tibia with two lateral spines. First metatarsomere with two latero-apical spines and 6-7 intermediate spines. Gonoplacs rounded. Phallobase asymmetrical, narrow, with basal or subapical processes; ventral phalobase lobe shorter than the dorsal lobe. Aedeagus without ventral hooks. Male anal tube enlarged apically or elongate (in dorsal view).

Figures 1–11. 

E. guangxiensis sp. n. 1 Adult (male), dorsal view 2 Adult (male), in ventral view 3 Adult (male), in lateral view 4 Head and thorax (male), in dorsal view 5 Face (male), in frontal view 6 Head (male), in lateral view 7Fore wing (male) 8 Hind wing (male) 9 Male genitalia, in lateral view 10 Anal tube, in dorsal view 11 Penis, in dorsal view from caudad; Scale bars: 1.0 mm (1–3), 0.5 mm (4–11).

Figures 12–20. 

E. guangxiensis sp. n. 12 Anal tube (male), in dorsal view 13 Anal tube (male), in lateral view 14 Pygofer (male), in lateral view 15 Penis, in lateral view (left) 16 Penis, in lateral view (right) 17 Penis, in ventral view 18 Penis, in dorsal view 19 Connective, in lateral view 20 Gonostylus, in lateral view. Scale bars: 0.5 mm.

China (Guangxi); Vietnam (Ninh Binh, Ha Noi, Vinh Phuc, Hoa Binh, Haiphong and Lam Dong Provinces) (Figure 21).

Figure 21. 

Geographic distribution of Euxaldar species.

E. jehucal Fennah, 1978 (Vietnam: Ninh Binh, Ha Noi, Vinh Phuc, Hoa Binh and Haiphong Provinces)

E. lenis Gnezdilov, Bourgoin & Wang, 2017 (Vietnam: Lam Dong Provinces)

E. guangxiensis sp. n. (China: Guangxi Province)

Holotype: 1 ♂, China: Guangxi, Nonggang National Nature Reserve (E106°58'3", N22°28'37"), 163 m, 29 Oct. 2017, K.K. Liu

Body length (from apex of vertex to tip of forewing): male 3.8mm; Forewing: male 3.3mm

Coloration. Male: Coryphe (Figure 4) dark brown. Metope light brown yellowish, with pale pustules along its lateral margins. Clypeus (Figure 5) pale brown with dark brown band at base, rostrum and antenna dark brown (Figure 5). Pronotum and mesonotum brown (Figure 4). Forewings (Figure 7) dark brown, each with wide black band at midlength from costal margin to almost apex of clavus and with several light yellow patches including large one in basal part of the wing. Hind wing (Figure 8) dark brown. Legs (Figs 2–3) brown with dark brown markings. Abdomen (Figure 2) dark brown, with margins rufous.

Head and thorax. Coryphe (Figure 4) transverse, approximately 3.0 times wider than long, without carinae, anterior margin nearly straight, posterior margin slightly angularly concave. Metope (Figure 5) flat, 1.1 times longer than widest, without a median carina, with a row of distinct pustules along its lateral margins and rather weak pustules inside. Metopoclypeal suture (Figure 5) incomplete medially. Postclypeus with wide median carina. Pronotum (Figure 4) short, with keel-shaped margins. Paradiscal fields very narrow behind the eyes. Mesonotum (Figure 4) 3.3 times longer than pronotum in midline, with lateral carinae. Fore wings (Figure 7) oval, with smoothed, poorly recognizable reticulate venation; CuP distinct. Hind wings (Figure 8) rudimentary, 0.3 times as long as fore wings, veins obscure. Hind tibiae with 2 lateral teeth near apex. Spinal formula of the hind leg 7-7-2.

Male genitalia. Anal tube (Figs 10, 12, 13) elongate, wide at base part and narrow at apical part, slightly enlarged near apex, apical margin concave medially, laterally with two triangular processes near its middle. Anal column (Figure 12) located near base, 0.3 times as long as the anal tube in dorsal view. Pygofer (Figs 9, 14) in lateral view, with posterior margin distinctly convex. Phallobase asymmetrical, dorsally with three processes at base (Figure 18a, b), middle process of phallobase (Figs 15–16a, 18a) wide, with two teeth apically, lateral processes of phallobase (Figs 15, 16b, 18b) adjacent to middle process hook-shaped. Phallobase laterally with two processes near base, one of them is long and directed caudally (Figure 15c), the other short and directed cephalad (Figure 16d). Lateral phallobase lobes asymmetrical, narrowing apically, one is short directed caudally (Figure 15e), the other is long and curved cephalically (Figs 15f, 16f). Ventral phallobase lobe (Figure 17) not reaching the aedeagal apex, apical margin nearly straight. Connective (Figure 19) in shape of long and narrow cup. Gonostylus (Figure 20) triangular, with moderately convex hind margin, caudo-dorsal angle widely rounded.

The specific name refers to the locality, Guangxi province, China.

Unknown.

China (Guangxi province)

This species resembles E. jehucal and E. lenis, but can be distinguished from the latter in the following characteristics: Anal tube (Figs 10, 12–13) longer than broad, narrowing from half to apex, slightly expanded near apex, apical margin concave medially, laterally with triangular processes; phallobase (Figure 18) with three processes at base in dorsal view, middle process wide (Figs 15, 16a, 18a), with two teeth apically, lateral processes (Figs 15, 16b, 18b) hook-shaped; phallobase laterally with two processes (Figs 15c, 16d); lateral phallobase lobes asymmetrical, narrowing apically, one is short (Figure 15e), the other is long and curved cephalad (Figs 15f, 16f).