Chrysotimus taiwanensis, Wang & Chen & Yang, 2015

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2015, New and little known species of Dolichopodidae (Diptera) in Taiwan, Florida Entomologist 98 (2), pp. 752-752 : 752-

15. Chrysotimus taiwanensis sp. nov. ( Figs. 1 –3)

TYPE LOCALITY

Taiwan (Pingdong Dahanshan Mountain).

MALE

Body length 2.1–2.2 mm, wing length 2.2–2.3 mm.

Head metallic green with gray pollen; frons and face brilliant. Hairs and bristles on head yellow. Ocellar tubercle weak, with 2 very long oc and 2 very short posterior hairs. Lower postocular bristles (including ventral hairs) pale. Antenna blackish; first flagellomere ( Fig. 2 ) rather short, about 0.5 times wider than long; arista subapical, with basal segment very short. Proboscis blackish, with brown hairs; palpus dark brown, with yellow hairs and 2 brownish apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax brown; 4 dc, acr absent; scutellum with 2 pairs of bristles. Propleuron with 1 yellow bristle on lower portion. Legs including coxae yellow with 5th tarsomeres brown. Hairs and bristles on legs brownish; coxae with yellow hairs and bristles; fore coxa with 3–4 anterior and apical bristles, mid coxa with 2–3 anterior and apical bristles, hind coxa with 1 brown outer bristle near middle. Fore femur with 1 short av and 1short pv apically; mid and hind femora each with 1 av and 1 pv apically. Mid tibia with 2 ad and 1 pd, apically with 4 bristles; hind tibia with 2 ad and 1 pd, apically with 3 bristles. Fore tarsomere 1 with row of 8-10 v, mid tarsomere 1 without distinct v, hind tarsomere 1 with 7–8 short and black ventral bristles on basal 1/4, and row of 7–8 v. Relative lengths of tibia and 5 tarsomeres of legs. LI 4.8:2.8:1.2:1.0:0.5:0.5; LII 6.4:2.6:1.6:1.0:0.6:0.5; LIII 6.8:3.0:2.0:1.2:0.8:0.6.

Wing hyaline; veins brownish, R 4+5 and M parallel apically; CuAx ratio 0.30. Squama yellow with pale yellow hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollen, dorsum brilliant. Hairs and bristles on abdomen brown.

Male genitalia (Fig. 3): Epandrium about as long as wide, apically with 1 slender lateral process; surstylus wide, deeply bifurcated; cercus large with acute apex.

FEMALE

Body length 2.1–2.3 mm, wing length 2.2–2.3 mm. Similar to male, but hind tarsomere 1 without black ventral bristles at base.

TYPE MATERIAL

HOLOTYPE, 1 male, Taiwan: Pingdong Dahanshan mountain , alt. 1,500-1,600 m, 7-VI- 2011, Xiaoyan Liu . PARATYPES, 2 males, same data as holotype . Other materials: 2 males, 9 females, Taiwan: Wulan Fushan Shuiguanlu , 18-V-2007, Nanyi Cai ; 3 males, 3 females, Taiwan: Yilan Fushun botanic garden, alt. 670 m, 10-VI-2011, Xiaoyan Liu ; 3 males, 8 females, Taiwan: Hualian Bilvshenmu , alt. 2,150 m, 20-VI-2011, Xiaoyan Liu .

DISTRIBUTION

Taiwan (Hualian, Pingdong, Wulan, Yilan) .

ETYMOLOGY

The specific epithet derives from the type locality of Taiwan.

REMARKS

This new species is similar to Chrysotimus xuae Wang, Yang & Grootaert by the brown hairs and bristles on thorax, and the furcated surstylus, but may be separated from the latter by the 7–8 short and black ventral bristles on hind tarsomere 1 base, and the cercus with acute apex. In xuae , there are 15–16 short and black ventral bristles on hind tarsomere 1 base, the cercus has no distinct acute apex.

Figures

Fig. 1. Chrysotimus taiwanensis Wang & Yang, sp. nov., male: habitus, lateral view, scale bar = 0.4 mm.

Figs. 2 and 3. Chrysotimus taiwanensis Wang & Yang, sp. nov., male: 2. first flagellomere,lateral view,scale bar = 0.2 mm; and 3. genitalia,lateral view,scale bar = 0.1 mm.