Neurigona jiangsuensis Wang, Yang and Grootaert

Wang, Mengqing, Yang, Ding & Grootaert, Patrick, 2007, Notes on the Neurigona Rondani (Diptera: Dolichopodidae) from Chinese Mainland, Zootaxa 1388, pp. 25-43 : 33-34

Neurigona jiangsuensis Wang, Yang and Grootaert , sp. nov.

( Figs. 11–13 )

Diagnosis. Three strong dc bristles, acr bristle absent. Coxa I with yellow bristles. Tarsomere I1 and tarsomere II1 much elongated. Abdominal segment 5 with brown ventral projection.

Description. MALE. Body length 4.2 mm, wing length 4.0 mm.

Head metallic green with pale gray pollen; face narrow, eyes contiguous on median portion of face. Hairs and bristles on head black; postocular bristles pale. Antenna brownish; first flagellomere about 1.5 times as long as wide, round apically ( Fig. 12 ); arista [apical segment broken] brownish with short basal segment. Proboscis brown with pale hairs; palp yellow, with pale hairs and 2 yellow apical bristles.

Thorax brownish with yellow pollen; scutellum and metanotum yellow; pteropleuron with a small black spot just below wing base. Hairs and bristles on thorax black, 3 strong dc (on posterior portion of mesonotum), acr bristle absent. Propleuron with 1 yellow bristle on lower portion. Legs yellow; coxae I–III yellow; tarsomeres I3–5 – III3–5 brownish to brown. Hairs and bristles on legs black. Coxa I with yellow hairs and 4–6 brownish bristles on antero­apical portion; coxa II with black hairs and 2­3 black anterior and apical bristles; coxa III with 1 black outer bristle at middle. Tibia II with 3 ad bristles, 2 pd bristles and 2 av bristles, apically with 3 bristles; tibia III with 1 ad bristle at base and one row of about 13 v bristles, apically with 3 bristles. Tarsomere I1 and tarsomere II1 much elongated, tarsomere I1 longer than tibia I and tarsomere II1 longer than tibia II; tarsomeres I1–3 each with row of short erect hair­like v bristles; tarsomere II1 with 3 ad (2 of which at base) bristles, and row of about 16 short v bristles; tarsomeres III1–4 each with row of short v bristles. Relative lengths of tibia and 5 tarsomeres of legs LI 7.6: 8.5: 2.7: 1.6: 1.2: 1.1; LII 11.5: 13.5: 2.5: 2.0: 1.3: 1.0; LIII 16.0: 5.5: 4.8: 3.0: 2.1: 1.0.

Wing ( Fig. 11 ) hyaline; veins black, M1+2 gently bent apically and convergent with R4+5; CuAx ratio 0.53. Squama yellow with pale hairs. Halter brownish.

Abdomen yellow with yellow pollen; terga 2–4 each with a large black basal spot, tergum 5 with a small blackish basal spot; hypopygium shiny black. Abdominal segment 5 with brown ventral projection. Hairs and bristles on abdomen chiefly black.

Genitali a ( Fig. 13 ). Epandrium as long as wide, basally with 2 lateral processes (one slender, another long and thick); surstylus with wide dorsal lobe bearing long obtuse apex and acute process at dorsal corner, ventral lobe slender and curved, apically with thin finger­like projection. Cercus round with short hairs. Aedeagus slender.

FEMALE. Unknown.

Type material. Holotype male, Jiangsu: Songjiang, Sheshan, 6. V. 1964, WJ. Holotype deposited in SEMCAS.

Distribution. Known only from the type locality in Jiangsu.

Etymology. The specific epithet derives from the type locality in Jiangsu.

Comments. The new species is similar to Neurigona xizangensis Yang from Xizang, but can be separated from the latter by having 3 dc bristles and no acr bristle. In N. xizangensis , 6 dc bristles and 18–19 irregularly paired acr bristles are present ( Yang, 1999).

Figures

FIGURES 11 – 13. Neurigona jiangsuensis sp. nov. Male. 11. Wing; 12. first flagellomere and arista (apical segment broken); 13. genitalia, lateral view.