Neurigona hainana Wang, Chen & Yang, 2010

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2010, New species of the genus Neurigona (Diptera: Dolichopodidae) from China, Zootaxa 2517 (1), pp. 53-61 : 55-56

Neurigona hainana Wang, Chen & Yang sp. nov.

( Figs. 1–3 )

Diagnosis. Six strong dc bristles and 11–12 irregularly paired acr bristles present. Tarsomere II 1 elongated (longer than corresponding tibia, and than total length tarsomere II 2-5). Abdominal segment 5 without ventral projection; hypopygium black.

Male. Body length 3.5 mm, wing length 3.3 mm.

Head metallic green with pale gray pollen; eyes contiguous on median portion of face. Hairs and bristles on head black; postocular bristles pale. Antenna brownish; first flagellomere about as long as wide, apex somewhat round ( Fig. 2 ); arista brown with short basal segment. Proboscis brownish with yellow hairs; palpus pale, 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, 6 strong dc bristles (on middle and posterior portion of mesonotum), 11–12 irregularly 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; all tarsi with tarsomeres 2–5 brownish to dark brown outward. Hairs and bristles on legs black. Coxa I with black hairs and 4–6 black bristles on antero-apical 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 2 ad bristles and 2 pd bristles, apically with 3 bristles; tibia III with 3 ad bristles, 3 pd bristles, and row of about 8-10 v bristles, apically with 3 bristles. Tarsomere II 1 with 1 ad bristle and 4–5 pd bristles; tarsomeres III 1–4 each with row of short v bristles. Relative lengths of tibia and 5 tarsomeres of legs LI 4.2: 3.6: 1.8: 2.2: 1.6: 1.0; LII 4.6: 7.4: 1.8: 1.6: 1.0: 0.6; LIII 9.0: 3.2: 2.8: 1.8: 1.0: 0.6.

Wing ( Fig. 1 ) hyaline; veins dark brown, M gently bent apically and convergent with R 4+5; CuAx ratio 0.4. Squama yellow with brown margin, with pale hairs. Halter pale.

Abdomen yellow with yellow pollen; terga 2–5 each with large black basal spot; hypopygium shiny black. Abdominal segment 5 without ventral projection. Setae and bristles on abdomen chiefly black.

Genitalia ( Fig. 3 ). Epandrium as long as wide, basally with 2 large lateral processes; surstylus with wide dorsal lobe bearing shallow concave apex, ventral lobe slender and curved, with 3 apical bristles. Cercus white, somewhat rectangular, bearing white hairs. Aedeagus black, slender.

Female. Body length 3.2 mm, wing length 3.5 mm. Similar to male.

Type Material. Holotype: male, Hainan: Jianfengling, Tianchi , 2007.VI.5, Jinxian Liu . Paratype: 1 female, same data as holotype . Holotype and paratype deposited in CAU.

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

Distribution. Known only from the type locality in Hainan.

Remarks. The new species is similar to Neurigona yunnana Wang, Yang et Grootaert from Yunnan, but can be separated from the latter by having 10–11 irregularly paired acr and tarsomere I 5 dark brown. In N. yunnana , 17–18 irregularly paired acr bristles are present and tarsomere I 5 is white.

Figures

FIGURES 1–3. Neurigona hainana sp. nov. (male). 1. Wing. 2. First flagellomere and arista. 3. Genitalia, lateral view. C—cercus; H—hypandrium; LP—lateral process; SDL—surstylus dorsal lobe; SVL—surstylus ventral lobe; V— ventral. Scale bar = 0.25 mm.