Neurigona yunnana 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 : 38

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

( Figs. 21–23 )

Diagnosis. Four strong dc (on posterior portion of mesonotum) bristles and 4 paired acr bristles present. Apex of tarsomere I4 and entire tarsomere I5 white with white hairs. Abdominal segment 5 without ventral projection; hypopygium yellow.

Description. MALE. Body length 5.1 mm, wing length 4.0 mm

Head metallic green with pale gray pollen; face narrow, eyes separate on face. Hairs and bristles on head black; postocular bristles pale. Antenna brownish; first flagellomere about 1.3 times as long as wide, apex dark brown and round ( Fig. 22 ); arista brownish with short basal segment. Proboscis brown with brown hairs; palp yellow, with black hairs and 2 black apical bristles.

Thorax yellow with yellow pollen; scutellum and metanotum dark brown; pteropleuron with a small black spot just below wing base. Hairs and bristles on thorax black, 4 strong dc (on posterior portion of mesonotum) bristles, 4 paired acr bristles present. Propleuron with 1 yellow bristle on lower portion. Scutellum with 2 pairs of bristles, apical pair long and strong, basal pair about 1/3 of apical pair in length. Legs yellow; all coxae yellow; tarsi brownish with apex of tarsomere I4 and entire tarsomere I5 white. Hairs and bristles on legs black. Coxa I with black hairs and 4–6 black bristles on antero­apical portion; coxa II with black hairs and 2–3 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 2 ad bristles, 2 pd bristles, and row of about 12 v bristles, apically with 3 bristles. Apex of tarsomere I4 and entire tarsomere I5 white with white hairs; tarsomere II1 with 2 ad 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 9.3: 8.0: 5.2: 3.5: 1.7: 1.2; LII 8.5: 11.2: 4.3: 2.9: 1.7: 1.0; LIII 17.0: 5.0: 5.5: 3.1: 2.0: 1.0.

Wing ( Fig. 21 ) hyaline; veins black, M1+2 gently bent apically and convergent with R4+5; CuAx ratio 0.5. Squama yellow with pale hairs. Halter brownish.

Abdomen yellow with yellow pollen; terga 2–3 each with a large black basal spot, terga 4–5 entirely blackish; hypopygium yellow. Abdominal segment 5 without ventral projection. Hairs and bristles on abdomen chiefly black.

Genitalia ( Fig. 23 ). Epandrium as long as wide, basally with 2 lateral processes (one short and thin, another long and thick with lateral processes at apical 1/4); surstylus with wide dorsal lobe bearing furcated process, ventral lobe slender and curved, with wide projection at middle. Cercus somewhat round, white, with 1 long process, bearing white hairs apically. Aedeagus black, slender.

FEMALE. Unknown.

Type material. Holotype male, Yunnan: Mengla, Yaoqu, 11. V. 2005, XL. Holotype deposited in CAU.

Distribution. Known only from the type locality in Yunnan.

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

Comments. The new species is similar to Neurigona concaviuscula Yang from Sichuan, but can be separated from the latter by having 4 paired acr bristles. In N. concaviuscula , 17–18 irregularly paired acr bristles are present ( Yang, 1999).

Figures

FIGURES 21 – 23. Neurigona yunnana sp. nov. Male. 21. Wing; 22. antenna (excluding scape); 23. genitalia, lateral view.