Rhipidia (Rhipidia) sejuga, Zhang, Xiao, Li, Yan & Yang, Ding, 2014

Zhang, Xiao, Li, Yan & Yang, Ding, 2014, A review of the genus Rhipidia Meigen from China, with descriptions of seven new species (Diptera, Limoniidae), Zootaxa 3764 (3), pp. 201-239 : 227-229

Rhipidia (Rhipidia) sejuga sp. nov.

( Figs. 62–67 )

Diagnosis. Male antenna with six bipectinate flagellomeres. Pleuron brown with two brownish black longitudinal stripes. Wing grayish white with numerous small pale gray spots and some large and dark spots; Sc1 ending near one-third length of Rs; basal section of CuA1 proximad of fork of M. Lobe of gonostylus with six rostral spines.

Description. Male. Body length 5.5–6.0 mm, wing length 5.5–6.0 mm.

Head (fig. 63). Brownish black, dusted with grayish white. Hairs on head brownish black. Antenna 1.2 mm long. Scape and pedicel pale brown, flagellomeres one to nine pale yellow with basal enlargements and branches pale brown, remaining flagellomeres pale brown. First flagellomere stout basally; each of flagellomeres two to seven inclusive with two branches which are the longest at fourth or fifth flagellomere and slightly longer than corresponding flagellomere; flagellomeres eight and nine with single short branch; flagellomeres ten and eleven enlarged but not pectinate; terminal flagellomere longated, exceeding penultimate. Labellum and palpus brown with brown hairs.

Thorax (fig. 62). General brown, dusted with grayish white. Pronotum brownish black. Prescutum pale brown with a brown median stripe, stripe with anterior half represented by three black lines. Scutum brown, middle area paler, each lobe with a pale yellow spot. Scutellum brown, borders brownish black. Mediotergite brownish yellow to brown. Pleuron brown with two brownish black longitudinal stripes, upper one extending from cervical region to base of abdomen, lower one extending from fore coxa to hind coxa. Hairs on thorax white. Coxae brown; trochanters pale yellow; femora brownish yellow with broad brownish black subterminal rings; tibiae and tarsi pale brownish yellow with tips brownish black. Hairs on legs brownish black. Wing (fig. 64) grayish white; all cells with numerous small pale gray spots; slightly larger and darker spots at base of cell Sc, middle area of cell Sc, origin of Rs, fork of Sc, fork of Rs and tip of R1; veins pale yellow, darker in clouded areas. Venation: Sc1 ending near one-third length of Rs, Sc2 near its tip; basal section of CuA1 proximad of fork of M. Halter 0.7 mm long, white with knob darker.

Abdomen (fig. 62). Tergites and sternites brownish yellow. Hairs on abdomen white.

Hypopygium (figs. 65–67). Posterior margin of tergite nine gently emarginate. Gonocoxite with a single simple ventromesal lobe. Clasper of gonostylus arched at 2/3 length, suddenly narrowed to an apical spine. Lobe of gonostylus large; rostral prolongation relatively long with six spines immediately beyond midlength. Paramere with mesoapical lobe blackened, tip acute.

Female. Body length 6.5–7.0 mm, wing length 6.5–7.0 mm. Similar to male, but flagellomeres peach-shaped. Cercus and hypogynial valve brownish yellow.

Type material. Holotype male ( CAU), China: Beijing, Xiaolongmen (1300 m), 2012. VI. 23, Xuankun Li. Paratypes: 13 males 30 females ( CAU), same data as holotype. 2 males 4 females ( CAU), China: Beijing, Mt. Song (900 m), 2012. VI. 27, Wang Liang. 1 male 1 female ( CAU), China: Hebei, Mt.Baishi, 2012. VII. 15, Yang Li.

Distribution. China (Beijing, Hebei).

Etymology. The specific epithet is an adjective and refers to the six pairs of branches on flagellomeres of male antenna (from Latin sejugus =sexjugatus meaning “six-paired”).

Remarks. This new species is somewhat similar to R. (R.) reductispina Savchenko, 1983 from Russia in having similar clouds and venation of wing, but it can be easily distinguished from the latter by the male antenna (fig. 63) with six bipectinate. In R. (R.) reductispina , the male antenna has ten bipectinate flagellomeres (fig. 57).

Figures

FIGURES 62 – 64. Rhipidia (Rhipidia) sejuga sp. nov. 62: Habitus of male, lateral view; 63: Head of male, lateral view; 64: Wing. Scale bar: 62 = 2.0 mm; 63 = 0.5 mm; 64 = 1.0 mm.

FIGURES 65 – 67. Rhipidia (Rhipidia) sejuga sp. nov. 65: Hypopygium, lateral view; 66: Hypopygium, dorsal view; 67: Hypopygium, ventral view. Scale bar: 65 – 67 = 0.2 mm.