Hexatoma (Eriocera) perhirsuta Alexander, 1973

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) perhirsuta Alexander, 1973

Hexatoma (Eriocera) perhirsuta Alexander, 1973: 8. Type locality: India, Assam.

Specimens examined

. 1 male (CAU), China: Xizang, Sejilashan, 3200 m, 2013.VIII.2. 2 females (CAU), China: Xizang, Lulang, 2013.VII.28. 1 male (CAU), China: Xizang, Motuo, 80K, 2014.VII.23 , Yan Li (light trap) . 1 male (CAU), China: Xizang, Motuo, 80K, 2014.VII.31 , Yan Li (light trap) . 1 male (CAU), China: Xizang, Yigong, 2017.VIII.8 , Qicheng Yang.

Diagnosis

. Rostrum is very short; antenna has 6 segments, very long; vertical tubercle is large bulbous. Wing is brownish yellow; R2+3 is nearly three times length of R2+3+4; cell M1 is present; m-cu is near 1/6 of cell dm. Posterior margin of ninth tergite has a deep U-shaped notch; interbase is well-developed, a two-layered membranous structure with spine apex.

Redescription

. Male (N = 4): Body length 16.0-18.3 mm, wing length 18.2-21.3 mm, antenna length 46.0-61.2 mm.

Head (Figs 34-35) dark brown with very long abundant brown setae. Rostrum very short, dark brown; palpi brown. Antenna 6-segmented, very long, more than three times as long as wing; scape and pedicel blackish brown with long brown setae; flagellum dark brown with short brown setae. Vertical tubercle large bulbous, dark brown with abundant very long brown setae.

Thorax (Figs 34-35) dark brown with abundant very long brownish yellow setae. Legs: coxae dark brown with abundant very long brownish yellow setae; trochanters brownish yellow with long brownish yellow setae; femora yellow with short brownish yellow setae; tibiae and tarsi brown with short brown setae. Wing (Figs 34, 40) brownish yellow, stigma slightly brown; veins slightly brown, very inconspicuous against the ground. Venation: R2 moderately straight; R2+3 nearly three times as long as R2+3+4; cell M1 slightly longer than its petiole; m-cu near 1/6 of cell dm. Halter (Figs 34-35) length approximately 3.2 mm, halter stem grayish brown with brown setae; knob brown.

Abdomen (Fig. 34) with abundant very long brownish yellow setae. First three segments brown; segments 4-8 dark brown.

Male terminalia (Figs 34, 41-45) brown with long brownish yellow setae. Posterior margin of ninth tergite with a deep U-shaped notch; posterior margin of ninth sternite with a deep V-shaped shallow; gonocoxite large, elongate cylindrical; clasper of gonostylus long and slender, terminal spine decurved; lobe of gonostylus short and stout, swollen with setae at middle; interbase well-developed, a two-layered membranous structure with spine-like apex; aedeagus smaller.

Female (N =2): Body length 21.3-24.7 mm, wing length 19.6-22.5 mm, antenna length 3.1-3.5 mm.

Female (Figs 36-39) resembles male. Thorax more brownish yellow. Abdomen longer, venter more brownish yellow.

Ovipositor (Figs 36-39) elongate, reddish yellow. Cercus narrowed toward tip. Hypogynial valve shorter, narrowed toward tip.

Distribution

. India (Assam); China (Xizang).

Remarks

. This species was known previously only from India. This is the first record from China.