Toxorhina (Ceratocheilus) omnifusca, Zhang, Xiao, Li, Yan & Yang, Ding, 2015

Zhang, Xiao, Li, Yan & Yang, Ding, 2015, A review of the genus Toxorhina Loew from China, with descriptions of three new species (Diptera, Limoniidae, Limoniinae), ZooKeys 480, pp. 59-80 : 66-69

Taxon classification Animalia Diptera Limoniidae

Toxorhina (Ceratocheilus) omnifusca sp. n. Figs 7, 8

Diagnosis.

Rostrum shorter than wing. Prescutum dark brown. Pleuron dark brown with central region slightly darker. Wing tinged pale brown; R2+3 ending at or slightly beyond end of basal section of R4+5, basal section of CuA1 at or slightly before fork of M. Abdomen dark brown with with segments six to eight slightly darker. Male hypopygium with two pairs of gonostyl. Rods of aedeagus relatively short.

Description.

Male. Body length 6.0 mm, wing length 5.5 mm, rostrum length 3.5 mm.

Head (Fig. 7b). Brownish black. Hairs on head brownish black. Antenna length 0.6-0.7 mm. Scape and pedicel dark brown; flagellomeres brown to brownish yellow. Pedicel enlarged and nearly globose. First flagellomere subconical; remaining flagellomeres cylindrical, each flagellomere longer and slenderer than previous one, terminal two flagellomeres longest with several long hairs. Rostrum brownish yellow with brown hairs.

Thorax. Generally dark brown. Pronotum and prescutum dark brown. Scutum dark brown with middle area paler, each lobe with a paler spot. Scutellum brown with borders darker. Mediotergite dark brown (Fig. 7c). Pleuron (Fig. 7a) dark brown with central region slightly darker. Hairs on thorax dark brown. Coxae yellow to brownish yellow; trochanters brown; femora brownish yellow with bases yellow and tips pale brown; tibiae brownish yellow with tips pale brown; tarsi brownish yellow. Hairs on legs brown. Wing (Fig. 7d) tinged pale brownish yellow; veins brownish yellow. Venation: Sc1 just brfore origin of Rs, Sc2 near its tip; R2+3 ending beyond end of basal section of R4+5; basal section of CuA1 at fork of M; A1 curved suddenly at middle, basal half straight. Haltere length 0.8 mm, white.

Abdomen (Fig. 7a). Dark brown with segments six to eight slightly darker. Hairs on abdomen dark brown.

Hypopygium (Fig. 8). Generally brown to dark brown. Gonocoxite cylindrical. Clasper of gonostylus slender and rod-shaped, curved dorsally and outwards, tip acute. Lobe of gonostylus divided into two branches: outer one slender, curved ventrally and inwards; inner one relatively stout, strongly curved inwards. Interbase nearly oval, tip curved inwards. Aedeagus with tip divergent, rods relatively short.

Female. Body length 8.5 mm, wing length 6.5 mm, rostrum length 4.0 mm. Similar to male. Abdomen uniformly brown except hypopygium. Tenth tergite dark yellow to brownish yellow. Cercus brownish yellow with base paler. Hypogynial valve brownish yellow to brown with base yellow and middle area darker. Tip of hypogynial valve reaching just beyond middle of cercus (Fig. 7e).

Type material.

Holotype male (CAU), China: Sichuan, Pingwu, Laohegou (32°18'33"N, 104°42'45"E, 1100 m), 2012.V.22, Yang Li & Sipei Liu (light trap). Paratype: 1 female (CAU), same data as holotype.

Distribution.

China (Sichuan).

Etymology.

The specific epithet is an adjective and refers to the almost uniformly dark brown body (from Latin omnifuscus = omni- (adj., meaning “all”) + fuscus (adj., meaning “brown”)).

Remarks.

This new species is somewhat similar to Toxorhina (Ceratocheilus) tinctipennis in having the similar body color and venation of wing, but it can be easily distinguished from the latter by the male hypopygium with two pairs of gonostyl, the gonocoxite without lobe near base, and the interbase nearly oval (Fig. 8). In Toxorhina (Ceratocheilus) tinctipennis , the male hypopygium has one pair of gonostyl, the gonocoxite has a blunt lobe near base, and the interbase is rod-shaped (Fig. 12).