Dexopollenia guangxiensis Liu, Li & Yao sp. nov.

Figs 1–5, 6–10

Type material.

Holotype • (dissected), male (HAUST), China: Guangxi Zhuang Autonomous Region, Guilin City, Lingui District, Huangsha Yao Township, Anjiangping, 25°55'6"N, 109°94'4"E, 1. VI. 2023, 1340 m, leg. Shixin Liu. Paratype • 1 male (HAUST), same data as holotype .

Diagnosis.

Eyes with sparse short hairs; first and second antennal segments dark yellow, third antennal segment black except base dark yellow; facial carina not particularly developed; eyes 2 times higher than gena; thorax black, with dense white pollen; acr 1 + 2, ial 0 + 1, ppl absent; legs yellow except tarsus black; subcostal sclerite yellowish, bare; radial stem vein and subalar knob bare; abdomen with a mediodorsal dark vitta interrupted mediodorsally; cercus broad, terminal tip in dorsal view; paraphallus tip curved forward; hypophallus and acrophallus membranous.

Description.

Male. Thorax appears black in ground colour, slightly white pollinose. Wing brownish-yellow. Legs yellow, tarsus black. Abdomen largely yellow, with a mediodorsal dark vitta interrupted mediodorsally.

Head (Figs 1, 3, 4). Eyes red, with sparse short hairs; post-ocellar setae and post-vertical setae present, eyes holoptic; Frons narrow, interfrontalia surface disappears at narrowest part; parafrontal yellow, with six pairs of frontal setae; parafacial and ocellar triangle dark yellow, with yellowish-white tomentum; gena yellow, with dense black setae; lunule bare; first and second antennal segments dark yellow, third antennal segment black except base dark yellow, first and second antennal segments with black setae, third antennal segment about 2 times longer than second antennal segment, arista plumose, arista longer than third antennal segment, but not more than epistome; mid-facial plate dark yellow, facial carina not particularly developed; palpus yellow; eyes 2 times higher than gena; postgena concolorous with gena, all yellow; hairs on postgena mostly black, yellowish hairs posteriorly.

Thorax (Figs 1, 3) black, with slightly white pruinescence; prodorsum and dorsum of mesothorax with crinkly golden hair; acr 1 + 2, dc 2 + 3, ial 0 + 1, h 2, ph 1 + 0, pra 1, sal 1, pal 2; scutellum black, with a tuft of crinkly golden hairs; anterior and posterior spiracles yellow, proepimeral setae present; anepisternum black, with crinkly golden hairs, mpl 0 + 3, spl 1 + 1; ppl absent, with a tuft of crinkly golden hairs; inferior laterotergite bare.

Wings (Fig. 5) brownish-hyaline; epaulet and basicostal scale dark yellow, subcostal sclerite yellowish, bare; radial stem vein and subalar knob bare; 2 R 5 open, width 1 / 2 the length of r-m; upper calypter and lower calypter dark yellow, halter yellow.

Legs (Fig. 3) yellow except tarsus black, fore femur with 10 pv, 4 pd; fore tibia with 3 ad, 2 pd; mid femur with 2 a; mid tibia with 2 ad, 2 p, 1 d, 2 pd; hind femora with 8 ad, 4 pd; hind tibia with 3 ad, 3 pd.

Abdomen (Figs 2, 3) largely yellow, with a mediodorsal dark vitta interrupted mediodorsally; ST 1–4 with long black setae, terminal margin of lateral lobe of ST 5 with a black spot (Fig. 9); epandrium with long dense black setae. Male terminalia: medial side of surstyli with dense black hairs in posterior view (Fig. 6); cerci broad, terminal tip in posterior view (Fig. 6); surstyli broad and terminal rounded in lateral view (Figs 7, 8); pregonite with a row of black setae, and postgonites with one black seta; paraphallus terminal curved forward; hypophallus and acrophallus membranous (Figs 8, 10).

Female. Unknown.

Measurements.

Male. Body length 5.1–8.6 mm.

Etymology.

The specific epithet is chosen after Guangxi Province where the holotype was collected.

Distribution.

China (Guangxi).

Remarks.

This new species is similar to D. maculata Villeneuve, 1933, but differs in the following points: ial 0 + 1, ad 2, T 1–4 with a mediodorsal dark vitta interrupted mediodorsally, and cerci broad in dorsal view. Further, the new species paraphallus is slightly wider and rounded terminally compared to the D. maculata paraphallus, and the new species postgonites is longer than the D. maculata postgonites.