Dactylolabis (Dactylolabis) gracilistylus Alexander, 1926

Gao, Shang, Zhang, Bing & Yang, Ding, 2021, A new species of Dactylolabis subgenus Dactylolabis Osten Sacken, 1860 from China (Diptera, Limoniidae), ZooKeys 1047, pp. 91-100 : 91

Dactylolabis (Dactylolabis) gracilistylus Alexander, 1926

Figs 1-3 , 4-7

Dactylolabis gracilistylus Alexander, 1926: 372. Type locality: China: Zhejiang.

Diagnosis.

Wing yellowish hyaline, pterostigma brownish. Vein R3 as long as vein R2+3. Veins R4 and R5 relatively straight. Vein M1 as long as vein M1+2. Crossvein m-cu located before or near base of cell dm. Posterior margin of 9t with an M-shaped process and a shallow V-shaped notch at middle. Inner gonostylus slender, curved; gonocoxite very elongate and slender, more than twice as long as outer gonostylus. Aedeagus very big, with a shallow V-shaped notch at posterior margin.

Redescription.

Male (n = 3). Body length 8.2-8.5 mm, wing length 8.4-8.8 mm, antenna length 1.6-1.7 mm.

Head (Figs 1 , 2 ) dark brown with pale gray pollen. Vertex with long setae. Rostrum and palpus brown. Antenna brown.

Thorax (Figs 1 , 2 ) mostly dark brown with gray pollen. Pronotum rather long; mesonotum brownish, prescutum dark brown with pale gray pollen. Thoracic pleuron mostly dark brown with dense gray pollen. Legs: coxae brown with gray pollen; trochanters brownish-yellow; femora more yellow at base, brownish-yellow at tip; tibiae brownish-yellow; tarsi brown. Wing (Figs 1 , 3 ) yellowish hyaline, pterostigma more brownish; veins brownish. Venation: Rs long; R2 relatively oblique; R3 as long as R2+3; R4 and R5 relatively straight; M1 as long as M1+2; m-cu located before or near base of cell dm. Halter (Fig. 1 ) length approximately 1.3 mm, halter stem yellowish; halter brownish.

Abdomen (Fig. 1 ) elongated, tergites brownish-yellow, sternites dark brown.

Hypopygium (Figs 1 , 4-7 ) dark brown with brownish setae. Surface of 9t with plenty of long setae, posterior margin with an M-shaped process, medially with a shallow V-shaped notch; posterior margin of 9s with plenty of long setae; outer gonostylus cylindrical; inner gonostylus slender, curved; gonocoxite very elongate and slender, more than twice as long as outer gonostylus; aedeagus hyaline, very big, posterior margin with a shallow V-shaped notch.

Female. Similar to male ( Alexander 1926: 372).

Material examined.

1 male (CAU), China: Zhejiang, Yuyao, Siming Mountain , 1980.IV.27 , Jikun Yang. 1 male (CAU), China: Zhejiang, Qingyuan, Baishanzu , 1984.IV.19 , Hong Wu. 1 male (CAU), China: Zhejiang, Deqing, Mogan Mountain , 1991.IV.20.

Distribution.

China (Zhejiang).

Figures

Figures 1 - 3. Dactylolabis (Dactylolabis) gracilistylus Alexander, 1926, male 1 habitus, lateral view 2 head and thorax, dorsal view 3 right wing. Scale bars: 1 mm.

Figures 4 - 7.. Dactylolabis (Dactylolabis) gracilistylus Alexander, 1926, male 4 hypopygium, dorsal view 5 hypopygium, ventral view 6 aedeagal complex, dorsal view 7 aedeagal complex, ventral view. Scale bars: 1 mm (4, 5); 0.5 mm (6, 7).