Brithura jinpingensis, Liu, Qifei & Yang, Ding, 2009

Liu, Qifei & Yang, Ding, 2009, Two new species of the genus Brithura Edwards from China, with a key to world species (Diptera, Tipulidae), Zootaxa 1991, pp. 51-56 : 52-54

Brithura jinpingensis sp. nov.

( Figs. 1 , 3–6 )

Diagnosis. Antennal flagellum blackish brown. Thoracic pleura dark reddish brown. Wings brown with costal border opposite stigma bulged in male. Legs brownish yellow. General coloration of abdomen light brownish orange. Outer gonostylus basally thick with a short subtriangular posterior process and a weak anterior process, apically strongly bent forward and finger-like.

Description. Male. Body length 26 mm, wing 19 mm.

Head. Rostrum chestnut brown, with stout blackish nasus. Vertex and occiput brownish. An inconspicuous narrow brownish stripe from vertical tubercle to occiput. Orbits paler. Hairs on head black. Antenna 6 mm long; scape brown; pedicel brownish; flagellum blackish brown, each segment basally slightly enlarged, scarcely lighter. Probocis dark brown; palpus yellowish brown, the last segment blackish brown.

Thorax. General reddish brown. Pronotum with dark brown central spot; prescutum with three brown longitudinal stripes, median one shorter and lighter, lateral ones each with a line of hairs; lateral margins of prescutum blackish brown; scutum medially silvery with long hairs on lateral margins, scutal lobe with a brown stripe in line with lateral stripe of prescutum but without hairs. A black stripe running through katepisternum, katepimeron and metakatepisternum. Hairs on thorax long, black. Coxae and trochanters brown; femora brownish yellow with extreme tips narrowly lighter, but fore and mid femora with an inconspicuous black subapical ring; tibiae brownish yellow; tarsi blackish brown; tibial spurs 1–1–2; claws simple. Hairs on coxae and trochanters yellow, on other segments of legs black. Wing ( Fig. 1 ) dark brownish yellow with costal region opposite stigma dilated but not broken. Cells C and Sc light reddish brown; stigma dark reddish brown. A black spot at origin of Rs, with yellow spot at both sides; area from stigma to cell dm along cord dark brown, outside with irregular yellow stripe; cell br and cell bm with yellowish cloud in outer end; cell R3, cell R4 and cell CuA2 with light yellow spot in outer half; cell M2, cell M3, cell A1 and cell A2 with light yellow spot at margin of wing. Veins yellow. Halteres with stem dark brown, knob more blackish but yellowish brown at tip.

Abdomen. Ground color light brownish orange. Tergites 1–7 with black lateral margin. Venter light brownish orange with sternites 7–9 brownish. Hairs on abdomen black.

Hypopygium ( Figs. 3–6 ). Tergite 9 ( Fig. 6 ) longer than wide, with two short wide posterior processes contiguous at middle, and with two small lateral incisions and one small middle incision; sternite 9 with one pair of obtuse processes at bottom and a long sclerotized middle ridge at basal half; outer gonostylus ( Fig. 5 ) basally thick with a short subtriangular posterior process and a weak anterior process, apically strongly bended forward and finger-like; inner gonostylus ( Fig. 4 ) nearly straight with wide base.

Female. Unknown.

Type material. Holotype male, Yunnan: Jinping, Yakou (1500 m), 2006. V. 18, Junhua Zhang.

Distribution. China (Yunnan).

Remarks. This new species is similar to B. imperfecta ( Brunetti, 1913) in having the dilated unbroken costa. It can be easily separated from the latter by having the strongly bent outer gonostylus and the dark brownish yellow wing. In B. imperfecta , the outer gonostylus is slightly bent, with an erect slender rod on the outer margin ( Alexander 1970).

Etymology. The species is named after the type locality Jinping.

Figures

FIGURES 1 – 2. Wing (male). 1. Brithura jinpingensis sp. nov.; 2. Brithura guangxiensis sp. nov.

FIGURES 3 – 6. Brithura jinpingensis sp. nov. Male. 3. Hypopygium, lateral view; 4. inner gonostylus, lateral view; 5. outer gonostylus, lateral view; 6. ninth tergite, dorsal view. Scale bar of 3 = 0.5 mm, 4 – 6 = 0.25 mm.