Hexatoma (Eriocera) nepalensis (Westwood, 1836)

Zhang, Bing, Yang, Qicheng, Li, Yan & Yang, Ding, 2021, Hexatoma (Eriocera) Macquart (Diptera, Limoniidae) from Xizang, China, ZooKeys 1071, pp. 155-173 : 155

Hexatoma (Eriocera) nepalensis (Westwood, 1836)

Caloptera nepalensis Westwood, 1836: 681. Type locality: Nepal.

Pterocosmus velutinus Walker, 1848: 79. Type locality: Nepal.

Lechria nepalensis Brunetti, 1918: 317. Type locality: Nepal (Katmandu).

Eriocera nepalensis Westw. (= velutina, Walk.): Edwards 1921: 76.

Pterocosmus velutinus ( Eriocera nepalensis ): Edwards 1921: 99.

Lechria nepalensis : Edwards 1924: 301.

Trichoneura (Xipholimnobia) nepalensis : Alexander 1963: 24; Alexander 1968: 95.

Hexatoma (Eriocera) nepalensis : Mitra et al. 2006: 234; Men and Yu 2015: 165.

Specimens examined

. 1 male (CAU), China: Xizang, Chayu , 1570 m, 1978.VI.25, Fasheng Li. 1 male (CAU), China: Xizang, Chayu, 1700 m, 1978.VI.26, Fasheng Li. 1 male (CAU), China: Xizang, Beibeng, 2014.VII.27, Yan Li. 1 female (CAU), China: Xizang, Chayu, 2014.VIII.3, Yan Li. 1 male, 2 females (CAU), China: Xizang, Linzhi, Gongbujiangda, Ganglangcun. Holotype: male, Nepal, Hardwicke Bequest; accession no. NHMUK010397658, BMNH(E)247599 (BMNH).

Diagnosis

. Antenna has 8 segments. Wing is brown, but yellowed at basal 1/5; anal cells are much paler; a white discal area is before cord, including cell R1 to cell CuA1; m-cu is near 2/3 of cell dm. Posterior margin of tergite 9 is produced; interbase is triangular, stubby at base.

Redescription

. Male (N = 4): Body length 12.5-22.5 mm, wing length 12.4-15.5 mm, antenna length 3.3-3.8 mm.

Head (Figs 9-11) velvet black with black setae. Rostrum and palpus blackish brown. Antenna 8 segmented, blackish brown with brown setae.

Thorax (Figs 9-11) velvet black with blackish brown setae. Legs with blackish brown setae; coxae and trochanters velvet black with long setae; femora, tibiae and tarsi blackish brown. Wing (Figs 9-10, 16) brown, basal 1/5 yellowed, anal cells much paler; a white discal area before cord, including cell R1 to cell CuA1; veins brown, more yellowed in brightened areas. Venation: R2 oblique, R2+3 relatively short, shorter than R2; cell M1 lacking; m-cu near 2/3 of cell dm. Halter (Figs 9-11) length approximately 2.1 mm, grayish brown with blackish brown setae.

Abdomen (Figs 9-10) with short black setae. Segments 2-5 elongate, shining black at base, pale white gray in middle, velvet black at tip; segments 1 and 6-7 velvet black; segment 8 shining black.

Male terminalia (Figs 9-10, 17-21) shining black with blackish brown setae. Posterior margin of ninth tergite produced, its margin concave; posterior margin of ninth sternite with a deep U-shaped shallow; gonocoxite moderately stubby; clasper of gonostylus with long setae at base, slender, terminal spine decurved; lobe of gonostylus short and stout, terminal margin swollen with long setae; interbase triangular, stubby at base; aedeagus longer, apically directed ventrally.

Female (N =3): Body length 17.3-19.4 mm, wing length 13.3-15.4 mm, antenna length 3.6-4.4 mm.

Female (Figs 12-15) resembles male. Abdomen shorter; tergites 2, 4-5 pale white gray at base, velvet black at tip; tergites 1, 3, 6-7 velvet black; sternites 1-7 velvet black; segment 8 velvet orange.

Ovipositor (Figs 12-15) elongate, velvet orange. Cercus narrowed toward tip. Hypogynial valve shorter, narrowed toward tip.

Distribution

. Afghanistan; China (Sichuan, Guangdong, Xizang), India (Assam and/or Arunachal Pradesh), Malaysia (Peninsula), Nepal.

Remarks

. This species is here recorded from Xizang, China for the first time.