Libnotes (Laosa) fuscinervis Brunetti, 1912

Kang, Zehui & Zhang, Xiao, 2021, New species and records of the subgenus Libnotes (Laosa) Edwards (Diptera, Limoniidae) from China with a key to world species, ZooKeys 1041, pp. 101-112 : 101

Libnotes (Laosa) fuscinervis Brunetti, 1912 Figs 4 , 5

Libnotes fuscinervis Brunetti, 1912: 411. Type locality: Dajiling, East Himalayas (India).

Specimens examined.

Paratype, male (NHM), India: East Himalayas , Dajiling (1829 m), 1908.IX.22, E. Brunetti . Other material: 1 male (QAU), China: Yunnan, Lvchun, Yakou (1931 m), 2016.VII.7, Qilemoge .

Diagnosis.

Anterior scutum brown with a broad, posteriorly subdivided, dark brown median stripe and a spot on each side of it; posterior half of median stripe with a paler division that broadens out across posterior scutum and scutellum. Pleura brownish yellow with a broad, anteriorly indistinct, brownish black stripe extending from cervical region to mediotergite. Tip of wing round. Wing with many conspicuous spots but without conspicuous crossband from top to bottom. Sc long, ending at 1/3 of cell dm. Rs slightly curved. R2 before tip of Sc2 and distance between them about length of R2. Crossvein r-r before distal end of cell dm. Additional cross vein in cell r5 absent; m-m twice as long as basal section of M3. Basal section of CuA1 far beyond fork of M and at about 1/4 of cell dm. Tip of A2 slightly curved.

Description.

Male. Body length 9.5 mm, wing length 14.5 mm.

Head (Fig. 4b ). Brownish yellow. Hairs on head brown. Antenna length 2.0 mm, dark brownish yellow. Scape long cylindrical; pedicel oval, nearly as long as first flagellomere; flagellomeres oval, tapering apically, terminal flagellomere 1.5 times as long as preceding segment. Mouthparts brown with white hairs; palpus brown with brown hairs.

Thorax (Fig. 4c ). Pronotum brownish yellow. Prescutum brown. Anterior scutum brown with a broad, posteriorly subdivided, dark brown median stripe and a spot on each side of it; posterior scutum brownish black with a broad yellow median stripe. Scutellum brownish black with a broad yellow median stripe. Mediotergite brownish black with a narrow yellow median stripe. Pleura (Fig. 4a ) brownish yellow with a broad, anteriorly indistinct, brownish black stripe extending from cervical region to mediotergite. Hairs on thorax white. Coxae brownish yellow; trochanters yellow; femora brownish yellow with subtips brownish black; tibiae brownish yellow with tips narrowly brownish black; tarsi brownish yellow with tips brownish black. Hairs on legs dark brown. Wing (Fig. 4d ) tinged with pale brownish yellow. Many dark patches around cross veins and portions of longitudinal veins as well as patches in cells as shown in Fig. 4d ; four darker spots at base of wing, at base of Rs, at fork of Sc, and over R2 and tip of Sc2, the latter two spots connected by a narrow stripe along Sc2. Venation: Sc long, ending far beyond fork of Rs and at 1/3 of cell dm. Basal section of Sc2 near tip of Sc1. Tip of Sc2 nearly transverse, indistinct at wing margin. Rs very short, slightly sinuous. R2 before tip of Sc2 and distance between them about length of R2. Radial and medial veins distinctly curved caudally before wing margin. Crossvein r-r at basal 1/3 of cell r3. Cell dm elongate, more than 5 times as long as its width; m-m elongate, twice as long as basal section of M3. Basal section of CuA1 far beyond fork of M and at about 1/4 of cell dm. A1 straight, slightly curved near tip. A2 slightly sinuous. Halter length 1.5 mm, pale yellow with knob brownish black.

Abdomen. Tergites brownish yellow with lateral borders brownish black. Sternites brownish yellow, middle of first sternite paler. Hairs on abdomen white.

Hypopygium (Fig. 5 ). Ninth tergite with rounded posterior margin and small median emargination. Gonocoxite stubby with an elongate, blunt-apexed ventromesal lobe; inside edge with a large setose bulge. Outer gonostylus arched at 2/3 length, tip acute. Inner gonostylus short, oval with a long arched rostral prolongation armed with two spines at base from a single tubercle; an elongate lobe arising dorsally near base with a brush of long setae at apex, at right angle to lobe and directed laterally. Paramere wide at base, elongate, triangular distally. Penis long, tip sunken in the middle.

Female. Unknown.

Distribution.

China (Yunnan); India.

Remarks.

This species was known previously only from India. Now it is recorded from China for the first time.

Figures

Figure 4. Libnotes (Laosa) fuscinervis Brunetti, 1912 a habitus of male, lateral view b head, dorsal view c thorax, dorsal view d wing. Scale bars: 5.0 mm (a); 2.0 mm (d); 1.0 mm (b, c).

Figure 5. Libnotes (Laosa) fuscinervis Brunetti, 1912 a male hypopygium, dorsal view b male hypopygium, ventral view. Scale bars: 0.5 mm.