Helius (Helius) stenorhynchus stenorhynchus Alexander, 1954

Xu, Yuanyuan, Zhang, Shenglin, Wang, Guoquan, Yang, Ding & Zhang, Xiao, 2023, First records of the crane fly genus Helius Lepeletier & Serville (Diptera, Limoniidae) in Guangxi, China with description of one new species, ZooKeys 1168, pp. 131-149 : 131

Helius (Helius) stenorhynchus stenorhynchus Alexander, 1954

Figs 7 , 8

Helius (Helius) stenorhynchus Alexander, 1954: 161. Type locality: Myanmar, Kambaiti.

Specimens examined.

China • 5 ♂, 2 ♀; Guangxi Zhuang Autonomous Region, Tianlin County, Cenwanglaoshan National Nature Reserve , Langping protection station; 1550 m a.s.l.; 23 May 2013; Guoquan Wang leg.; CAU .

Diagnosis.

Antenna with basal flagellomeres oval and crowded. Rostrum unusually long and slender, about equal in length to combined head (excluding rostrum) and thorax. Prescutum and presutural scutum brownish red with an indistinct darker median line, anterior region more or less infuscated. Femora of legs yellow with narrowly darker tips. Wing with oval brown stigma and inconspicuous dark seams; Sc atrophied, sc-r at its tip and ending slightly before fork of Rs; m-cu beyond fork of M. Outer gonostylus nearly straight; inner spine shorter and stouter. Interbase nearly globular with a curved, apically blackened spine-shaped outgrowth. Distal half of aedeagus curly dorsally.

Description.

Male (Fig. 7a ). Body length 8.0-8.2 mm (excluding rostrum), wing length 7.8-8.0 mm, rostrum length 2.3-2.4 mm, antenna length 1.4-1.5 mm.

Head (Fig. 7b ). Brownish black. Setae on head dark brown. Antenna brown, scape and pedicel brownish black, flagellomeres brown with basal segments darker. Scape long cylindrical, 3 times as long as wide; pedicel nearly oval, widened distally; basal flagellomeres oval and crowded, with short brown verticils, outer flagellomeres tapering apically and elongated, with long brown verticils that exceed length of corresponding flagellomere. Rostrum unusually long and slender, about equal in length to combined head (excluding rostrum) and thorax, brownish black with dark brown setae. Palpus pale brownish yellow with pale brown setae.

Thorax (Fig. 7c ). Pronotum brownish red with middle darker. Prescutum and presutural scutum brownish red with an indistinct darker median line, anterior region more or less infuscated. Postsutural scutum brownish red, each lobe with a small white spot. Scutellum and mediotergite dark brown. Pleuron (Fig. 7a ) dark brown. Setae on thorax dark brown. Fore and mid coxae pale yellow, hind coxa paler; trochanters pale yellow, tips narrowly black; femora yellow, tips narrowly darker; tibiae and tarsi dark yellow to pale brownish yellow. Setae on legs brown. Wing (Fig. 7d ) tinged with grayish yellow. Stigma oval and brown; inconspicuous dark seams on cord, outer end of cell dm and CuA, darker on anterior cord. Veins pale brown to brown. Venation: Sc atrophied; sc-r at tip of Sc, ending slightly before fork of Rs; distance between tips of R4 and R5 3-4 times as long as distance between tips of R1 and R4; cell dm about twice as long as wide; m-cu about 1/4 its length beyond fork of M. Halter yellow.

Abdomen (Fig. 7a ). Brown with first abdominal segment short and paler, segments 6-9 slightly darker; caudal border of each segment narrowly brownish black. Setae on abdomen dark brown.

Hypopygium (Fig. 8 ). Pale brown. Posterior margin of tergite 9 with a very shallow emargination (Fig. 8a ). Gonocoxite nearly cylindrical, outer side with long brown setae (Fig. 8a, b ). Outer gonostylus nearly straight, distal half blackened; tip weakly bispinous, inner spine shorter and stouter (Fig. 8a, b, e ). Inner gonostylus arched, broad at base and gradually narrow, middle of outer side with short and stout pale brown setae, middle of inner side with long pale brown setae (Fig. 8a, b, e ). Aedeagal complex with semen pump spherical (Fig. 8c, d ); ejaculatory apodeme distinctly flattened, nearly rectangular (Fig. 8c, d ); aedeagus with distal half curly dorsally (Fig. 8a-d ). Parameres fused forming flattened transverse plate with short basal and apical parts, tip of apical part bent dorsally. Interbase nearly globular with a curved, apically blackened spine-shaped outgrowth (Fig. 8c, d, f, g ).

Female. Body length 7.8-8.0 mm (excluding rostrum), wing length 7.6-8.0 mm, rostrum length 2.2-2.3 mm. Generally similar to male by body coloration. Ovipositor (Fig. 7e ) with tergite 10 brown. Cercus brownish yellow to brown, long and slender, distal part curved dorsally, tip acute. Sternite 8 brown. Hypogynial valve yellow with base brown, tip slightly before middle of cercus.

Distribution.

China (Guangxi); Myanmar.

Remarks.

Helius (H.) stenorhynchus stenorhynchus was previously known only from Myanmar ( Oosterbroek 2023) and is now recorded in China for the first time. For descriptions and illustrations of this subspecies, also see Alexander (1954).

Figures

Figure 7. Helius (Helius) stenorhynchus stenorhynchus Alexander, 1954 a habitus of male, lateral view b male head, lateral view c male thorax, dorsal view d male wing e female ovipositor, lateral view. Scale bars: 2.0 mm (a); 1.0 mm (b); 0.5 mm (c); 1.0 mm (d); 0.4 mm (e).

Figure 8. Helius (Helius) stenorhynchus stenorhynchus Alexander, 1954 a male hypopygium, dorsal view b male hypopygium, ventral view c aedeagal complex, dorsal view d aedeagal complex, ventral view e gonostyli, dorsal view f interbase, dorsal view g interbase, lateral view. Scale bars: 0.2 mm (a, b); 0.1 mm (c, d, e); 0.05 mm (f, g).