Neurigona quadrimaculata, Lin & Wang & Yang, 2024

Lin, Chen, Wang, Mengqing & Yang, Ding, 2024, The genus Neurigona Rondani, 1856 (Diptera, Dolichopodidae) from Yunnan, China, with descriptions of seven new species and a key to the species of China, ZooKeys 1190, pp. 319-345 : 319

Neurigona quadrimaculata sp. nov.

Figs 6 , 8

Type material.

Holotype: ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 21 ♂♂, the same data as holotype (CAU).

Diagnosis.

Eyes contiguous on face. Postnotum and laterotergite dark brown. Thoracic pleuron with four dark spots. Mid tarsus with row of crochet-like av hairs. Ventral surstylus longer than dorsal surstylus, rather narrow, but wide at apex; dorsal surstylus very wide, ~ 3 × wider than ventral surstylus, with a long acute apico-dorsal process.

Description.

Male (Fig. 6A ). Body length 5.2-6.1 mm, wing length 4.6-4.9 mm.

Head metallic green with pale gray pollinosity; face very narrow, eyes contiguous on face. Hairs and bristles on head black, but postocular bristles (except uppermost two) and postero-ventral hairs yellow. Antenna (Fig. 8F ) yellow except first flagellomere brownish; first flagellomere basally wide, apically narrowed and obtuse, approximately as long as wide, with brown pubescence; arista subapical, dark brown. Proboscis pale yellow with dark yellow hairs; palpus pale yellow with blackish hairs and two short black apical bristles.

Thorax dark yellow with fine pale yellow pollinosity; mesonotum wholly dark yellow, postalar callus with a small dark brown spot; scutellum yellow; postnotum and laterotergite dark brown; mesopleuron, sternopleuron (except posterior portion), and hypopleuron (except postero-dorsal corner) dark brown, pteropleuron brown with a small black spot. Hairs and bristles on thorax black, six strong dc gradually becoming longer backward, 11-12 irregularly paired acr short and hair-like; scutellum with two pairs of sc, lateral pair long and strong, median pair very short and weak. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but brown or dark brown from tip of tarsomere 1 onward. Hairs and bristles on legs black except hairs on fore coxa yellow. Fore coxa with four thick yellow bristles on antero-apical portion; mid coxa with three mostly dark yellow anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Mid and hind trochanters each with one spine-like outer bristle at middle. Fore tibia devoid of bristles. Mid tibia with three ad, two pd, and two strong apical bristles. Hind tibia with three ad, three pd, three strong apical bristles, and one row of yellow comb-like bristles. Mid tarsus with row of crochet-like av hairs; tarsomere 1 with one short ad at middle and one long pd at extreme tip. Relative lengths of tibiae and five tarsomeres of legs - LI 5.5: 5.9: 3.2: 2.3: 1.2: 0.8; LII 7.6: 7.9: 3.3: 1.8: 1.1: 0.8; LIII 11.2: 4.2: 4.0: 1.9: 1.2: 0.8.

Wing nearly hyaline, tinged brown; veins brown, M1+2 gently bent apically and convergent with R4+5; CuAx ratio 0.29. Squama yellow with pale yellow hairs. Halter pale yellow.

Abdomen yellow with yellow pollen; terga 2-5 each with large blackish basal spot. Hairs and bristles on abdomen chiefly black except those on venter more or less yellow.

Male genitalia (Fig. 6B ) mainly shiny black. Epandrium longer than wide, with short acute apico-dorsal corner, with three lateral processes, ventral one long and finger-like, middle one long and wide, apically with a nearly U-shaped incision; dorsal one long and wide, curly at tip. Ventral surstylus longer than dorsal surstylus, rather narrow, but wide at apex; dorsal surstylus very wide, ~ 3.0 × wider than ventral surstylus, with a long acute apico-dorsal process. Postgonite long and thick, covered with fine hairs. Cercus somewhat round, white, bearing short white hairs. Hypandrium long and wide. Phallus thin, hidden within hypandrium.

Female. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name refers to the thoracic pleuron with four dark spots.

Remarks.

The species is similar to N. qingchengshana Yang & Saigusa, 2021 from Sichuan, but may be separated from the latter by the fore tarsomere 1 longer than fore tibia, 1.1 × as long as fore tibia; and narrow ventral surstylus. In N. qingchengshana , the fore tarsomere 1 is as long as the fore tibia, and the ventral surstylus is rather wide ( Yang and Saigusa 2001a; Yang et al. 2011).

Figures

Figure 6. Neurigona quadrimaculata sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Figure 8. Antennae A Neurigona apicilata sp. nov. B Neurigona basicurva sp. nov. C Neurigona brevidigitata sp. nov. D Neurigona convexa sp. nov. E Neurigona huanglianshana sp. nov. F Neurigona quadrimaculata sp. nov. G Neurigona ventriprocessa sp. nov. Scale bars: 0.1 mm.