Brithura guangxiensis, 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 : 54-56

Brithura guangxiensis sp. nov.

( Figs. 2 , 7–10 )

Diagnosis. Antennal flagellum brownish yellow. Venter rich cinnamon brown to dark orange. Tergite 9 nearly as long as wide, basally slightly constricted, apically with a large medially deep incision nearly U-shaped. Outer gonostylus with two lobe-like processes, outer one apically acute, inner one apically obtuse with a weak anterior process and a short subtriangular posterior process.

Description. Male. Body length 27 mm, wing 20 mm.

Head. Rostrum yellowish brown, with stout blackish brown nasus. Vertex and occiput dark brown. Orbits paler. Tip of vertical tubercle slightly decurved. Hairs on head black. Antenna 6 mm long; scape brown; pedicel light brownish; flagellum brownish yellow, first two segments basally blackish. Proboscis blackish brown. Palpus blackish with black hairs.

Thorax. General yellowish brown. Central pronotum blackish brown; prescutum light yellowish brown with three darker brown stripes, median one unclear, lateral ones either with short blackish hairs; lateral margins of prescutum brownish; scutum brown, scutal lobe either with small silvery gray hairs. Paratergite brownish, outer margin yellowish; anepisternum yellowish brown; ketepisternum brown; laterotergite brown; pleurotergal tubercle large and conspicuous. Hairs on thorax brown. All legs similar in coloration. Coxae and trochanters brown; femora brownish yellow with extreme tips dark brown; tibiae yellowish brown, but darker at tip; tarsi brown, but darker at tip. Tibial spurs 1–1–2; claws simple. Hairs on legs black. Wing ( Fig. 2 ) brownish yellow; costal region opposite stigma not dilated; Sc margined with yellow. A brown spot at origin of Rs, area from stigma to cell dm along cord yellowish brown, outside with yellow suffusion; grayish brown spot at upper side of middle of A1. Veins yellow. Halteres with stem brown, knob blackish brown.

Abdomen. Tergites 1–3 cinnamon brown, the rest dark orange; sternites 1-8 dark cinnamon brown with small orange spots. Fine hairs on abdomen black.

Hypopygium ( Figs. 7–10 ). Tergite 9 ( Fig. 10 ) nearly as long as wide, basally slightly constricted, apically with a large medially deep incision nearly U-shaped; sternite 9 with an obtuse median process at base. Outer gonostylus ( Fig. 9 ) with two lobe-like processes, outer one apically acute, inner one apically obtuse with a weak anterior process and a short subtriangular posterior process; inner gonostylus ( Fig. 8 ) distinctly curved, basally very thick with one short finger-like process, and apically long finger-like. Hairs on gonostylus yellow.

Female. Unknown.

Type material. Holotype male, Guangxi: Xing’an, Maoer Mountin, Jinshi (1200 m), 2006. VIII. 6, Xiaoshuan Bai.

Distribution. China (Guangxi).

Remarks. This new species is somewhat similar to B. nymphica Alexander, 1927 in having the similar coloration of the thorax and wings. It can be easily separated from the latter by tergite 9 with a medially large U-shaped incision and two lobe-like processes of the outer gonostylus. In B.nymphica , the median incision of tergite 9 is V-shaped; the outer gonostylus has two processes terminating in a long slender rod.

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 7 – 10. Brithura guangxiensis sp. nov. Male. 7. Hypopygium, lateral view; 8. inner gonostylus, lateral view; 9. outer gonostylus, lateral view; 10. ninth tergite, dorsal view. Scale bar of 7 = 0.5 mm, 8 – 10 = 0.25 mm.