Libnotes (Laosa) baiyunensis, Kang & Zhang, 2021

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) baiyunensis sp. nov. Figs 2 , 3

Specimens examined.

Holotype, male (CAU), China: Henan, Songxian, Mt. Baiyun , 2002.VII.22, Ding Yang . Paratypes: 1 male (CAU), same data as holotype . 1 male 1 female (CAU), China: Henan, Songxian, Mt. Baiyun (1500 m), 2008.VIII.14, Ding Yang .

Diagnosis.

Anterior scutum brown with side edges brownish black. Pleura brownish yellow with a broad brownish black stripe extending from cervical region to base of wing. Tip of wing round. Wing nearly unpatterned except some pale brown patches around cross veins and portions of longitudinal veins, without conspicuous crossband from top to bottom. Sc long, ending near middle of cell dm. Rs slightly curved. R2 slightly before tip of Sc2. Two additional cross veins in cells r3 and r5, the former (r-r) beyond distal end of cell dm, the latter (r-m) aligned with distal end of cell dm; m-m twice as long as basal section of M3. Basal section of CuA1 far beyond fork of M and at about 1/3 of cell dm. Tip of A2 nearly straight.

Description.

Male. Body length 12.0-14.0 mm, wing length 19.0-22.0 mm.

Head (Fig. 2b ). Brown. Hairs on head brown. Antenna length 2.9 mm, brown. 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. 2c ). Pronotum brown with sides brownish black. Prescutum brown with side edges brownish black. Anterior scutum brown with side edges brownish black; posterior scutum brown. Scutellum pale brown. Mediotergite pale brown with sides brownish black. Pleura (Fig. 2a ) brownish yellow with a broad brownish black stripe extending from cervical region to base of wing. Hairs on thorax white. Coxae yellow; trochanters pale yellow; femora yellow to brownish yellow with tips dark brown; tibiae brown; tarsi brown. Hairs on legs dark brown. Wing (Fig. 2d ) tinged with pale brownish yellow. Darkened areas around cross veins, distal end of cell dm and CuA1, tip of M1+2, CuA and A2; three small spots at base of Rs, at fork of Sc, and over R2 and tip of Sc2. Venation: Sc long, ending far beyond fork of Rs and near middle of cell dm. Basal section of Sc2 very close to tip of Sc1. Tip of Sc2 nearly transverse, indistinct at wing margin. Rs very short, slightly sinuous. R2 slightly before tip of Sc2. Radial and medial veins distinctly curved caudally before wing margin. Two additional cross veins in cells r3 and r5, the former (r-r) at middle of cell r3, the latter (r-m) at basal 2/5 of cell r5 and aligned with distal end of cell dm. 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 1/3 of cell dm. A1 straight. A2 slightly sinuous. Halter length 2.6 mm, yellow with knob brown.

Abdomen. Tergites brownish yellow with a brown median stripe, lateral borders brown; eighth tergite brown. Sternites brownish yellow with eighth sternite brown. Hairs on abdomen white.

Hypopygium (Fig. 3 ). Ninth tergite with widely rounded posterior margin and small median emargination. Gonocoxite elongate, slender with an elongate, blunt-apexed ventromesal lobe; inside edge with small setose bulge. Outer gonostylus arched at 2/3 length, tip acute. Inner gonostylus short, oval with long, arched rostral prolongation armed with two spines near 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. Body length 11.5 mm, wing length 17.5 mm. Similar to male, but eighth tergite brownish yellow with a broad brown median stripe. Tenth tergite brown. Cercus (Fig. 2e ) brown, tip slightly exceeding tip of hypogynial valve. Hypogynial valve brownish yellow with borders darker, base slightly beyond base of tenth tergite.

Etymology.

The species is named after the type locality Mt. Baiyun.

Distribution.

China (Henan).

Remarks.

This species is somewhat similar to L. (L.) charmosyne from South Korea and Japan in having similar spots on the wing, but it can be easily distinguished from the latter by the pleura of the thorax being brownish yellow with a broad brownish black stripe, the crossvein r-r being 1.5 to 2 times its length before R2, the crossvein r-m being aligned with the distal end of cell dm, the basal section of CuA1 being far beyond the fork of M and at about 1/3 of cell dm (Fig. 2d ), and the inner gonostylus being about 2/3 length of the gonocoxite (Fig. 3a ), whereas in L. (L.) charmosyne , the pleura of the thorax is dark brownish gray, the crossvein r-r is near R2, the crossvein r-m is distinctly before the distal end of cell dm, the basal section of CuA1 is beyond the fork of M and at 1/6-1/5 of cell dm, and the inner gonostylus is half the length of the gonocoxite ( Alexander 1958; Podenas and Byun 2018).

Figures

Figure 2. Libnotes (Laosa) baiyunensis sp. nov. a habitus of male, lateral view b head, dorsal view c thorax, dorsal view d wing e female ovipositor, lateral view. Scale bars: 5.0 mm (a); 3.0 mm (d); 1.0 mm (b, c); 0.2 mm (e).

Figure 3. Libnotes (Laosa) baiyunensis sp. nov. a male hypopygium, dorsal view b male hypopygium, ventral view. Scale bars: 0.5 mm.