Ptychoptera lushuiensis Kang, Yao & Yang, 2013, sp. nov.

Ptychoptera lushuiensis sp. nov.

(Figs. 8–14)

Diagnosis. Wing marked with two narrow bands. Gonostylus broad at base, medial and distal parts with four projections; medial part with a finger-like projection interiorly and a semicircular projection externally; distal part with a finger-like projection interiorly and a hook-like projection externally.

Description. Male. Body length 7.0 mm, wing length 8.5 mm. Head mostly yellow, except vertex black. Hairs on head yellow, except vertex with uniformly short black hairs. Compound eyes black without pubescence. Antenna with first flagellomere 1.5 times as long as second flagellomere; scape, pedicel and basal 4/5 of first flagellomere yellow, 2nd to 13th flagellomeres brown, with uniformly black hairs. Proboscis yellow with black hairs. Palpus yellow, with black hairs.

Thoracic dorsum mostly black, except middle part of scutellum yellow brown; scutellum with a patch of dense black hairs at middle; mesopleuron uniformly yellow; katepisternum with sparse black hairs. Coxae and trochanters uniformly yellow; femora yellow at base, dark brown apically; tibiae mostly yellow brown; tarsomeres dark brown; claws dark brown. Hairs on legs black. Relative length of 1st to 5th tarsomeres in hindleg as 11.5: 2.4: 1.5: 1: 1. Wing (Fig. 14) 3.9 times as long as wide, subhyaline; wing marked with two narrow bands as follows: median band extending from basal of Rs to middle section of CuA; apical band broadest along anterior margin of wing, covering pterostigma, and extending to tip of M2; partly discontinuous on R2+3 and m1; veins brown; venation: Sc ending in C at level of basal 1/5 of R2+3; Rs short, as long as r-m. Haltere yellow brown, with black hairs; prehaltere yellow brown.

Abdomen: 1st tergum brown; 2nd to 5th terga mostly yellow, brown posterior margins; 6th to 8th terga brown; sterna yellow. Hairs on abdomen black. Male genitalia (Figs. 15–18): Epandrium with a pair of posterior projections, projection simple, broadest at base, tapering distally, curved downward, and rounded at distal end. Hypandrium broad at base, concave medially, medial part with a pair of small projections, with long black hairs; apical part U-shaped, with a pair of hook-like projections medially, X-shaped. Gonocoxite swollen ventrally.

Gonostylus broad at base, medial and distal parts with four projections; medial part with a finger-like projection interiorly and a semicircular projection externally; distal part with a finger-like projection interiorly, with short dense black hairs, and a hook-like projection externally. Paramere simple, with a pair of sclerotized triangular projections.

Female. Body length 8.0–9.0 mm, wing length 7.5–8.0 mm. Resembling male. Terminalia (Fig. 19): Cercus blade-like, 1.4 times as long as 8th sternum, 8th sternum 1.8 times as long as 7th sternum.

Type material. HOLOTYPE: 3, CHINA, Yunnan, Lushui, 2012. VII.25, Yuqiang Xi. PARATYPES: 43 20ƤƤ, Yunnan, Lushui, Pianma, 2012. VIII.1, Junchao Wang.

Distribution. China (Yunnan).

Etymology. The specific name refers to the type locality Lushui.

Remarks. This new species is somewhat similar to P. formosensis Alexander, but can be easily separated from it by the gonostylus having four projections, medially with a finger-like projection interiorly and a semicircular projection externally, distally with a finger-like projection interiorly and a hook-like projection externally. In P. formosensis Alexander, the gonostylus is complex in structure and has five projections as follows: basal part laterally with a long retrose projection dorsally; median part with two flat tongue-like projections; distal part with a rounded projection and a slender, finger-like projection (Nakamura & Saigusa 2009).