Macgregoromyia ternifoliusa, Liu, Qifei & Yang, Ding, 2011

Liu, Qifei & Yang, Ding, 2011, Three new species of the genus Macgregoromyia Alexander, with a key to world species (Diptera, Tipulidae), Zootaxa 2802, pp. 41-50 : 42-44

Macgregoromyia ternifoliusa sp. nov.

( Figs. 1–5 , 16–19 )

Diagnosis. Antennal scape brown, pedicel yellow, flagellum reddish brown. Wing grayish yellow, cell sc yellow; cell r3 to cell cua2 with macrotrichia. Tergite 9 with three processes. Sternite 9 with basal half membranous. Lobe of gonostylus with tip posteriorly produced; clasper of gonostylus laterally depressed inwards, beak pointed, dorsal crest smooth, posterior crest produced and rounded.

Description. Male. Body length 6.5 mm, wing 9.5 mm.

Head ( Fig. 2, 3 ). Rostrum short, brown, with brown nasus. Vertex blackish brown. Occiput blackish brown. Head with dense yellowish pruinescence. Hairs on head brown. Antenna 3.0 mm long; scape brown; pedicel yellow; flagellum long and cylindrical, reddish brown, terminal flagellomere very short, each segment basally with short brown hairs. Labellum dark brown; palpus are lacking.

Thorax ( Fig. 4 ). General blackish with yellowish pruinescence. Pronotum dark brown; mesonotal prescutum blackish brown with three longitudinal brownish yellow stripes; lateral border of prescutum brownish yellow; scutum blackish brown; scutellum blackish brown; mediotergite blackish brown with posterior half more blackened. Pleura brownish yellow, lower half of katepisternum blackened. Legs are lacking. Coxae brownish yellow; trochanters yellowish brown. Wing ( Fig. 5 ) grayish yellow, with cells c and sc yellow. Stigma brown with macrotrichia. Out ends of cell r3 to cell cua2 with macrotrichia, cell r3 and cell r4+5 even basally with macrotrichia. Sc1 absent, R1+2 entire, Rs oblique, r-m arcuate, entering Rs before fork of Rs, as long as basal part of Rs. Halter long, with stem brownish yellow, knob brown.

Abdomen. Ground color reddish brown. Tergites 1–6 reddish brown with posterior margin and lateral margin black, tergites 7 and 8 black. Sternites 1–6 yellowish brown with posterior margin reddish brown, sternites 7 and 8 black.

Hypopygium ( Fig. 16 ). Tergite 9 ( Fig. 17 ) black, posterior margin depressed, with three processes. Sternite 9 with basal half membranous. Lobe of gonostylus ( Fig. 18 ) subrectangular, twisted inwards at middle, tip posteriorly produced; clasper of gonostylus ( Fig. 19 ) laterally depressed inwards, with beak pointed, dorsal crest smooth, posterior crest produced and rounded, basal beak with tip rounded, posterior basal lobe dorsally broad.

Female. Unknown.

Type material. Holotype male, Hubei: Shiyan, Danjiangkou, Mountain Wudang, Nanyan (N 32˚24ʹ, E 111˚01ʹ, 1502 m), 3. VI. 1984, Jikun Yang. Male type specimen pinned dorsa-ventrally through left mid-thorax; all legs are missing.

Distribution. China (Hubei).

Remarks. This new species is similar to M. szechwanensis Alexander, 1932 , but it can be separated from the latter in the following features: R1+2 entire; tergite 9 with posterior margin bearing three processes; lobe of gonostylus broad at tip; clasper of gonostylus with dorsal crest smooth. In M. szechwanensis , R1+2 is absent; the posterior margin of tergite 9 has a V-shaped incision; the apex of the lobe of the gonostylus is narrowed; the dorsal crest of the clasper of the gonostylus is convex ( Alexander 1932).

Etymology. Name of the new species refers to the trilobed processes of tergite 9.

Figures

FIGURES 1 – 5. Macgregoromyia ternifoliusa sp. nov. 1. Habitus of male, dorsal view; 2. Head, dorsal view; 3. Head, lateral view; 4. Thorax, lateral view. 5. Wing.

FIGURES 16 – 19. Macgregoromyia ternifoliusa sp. nov. Male. 16. Hypopygium, lateral view; 17. ninth tergite, dorsal view; 18. lobe of gonostylus, lateral view; 19. clasper of gonostylus, lateral view. Scale bar of 16 – 17 = 0.2 mm, 18 – 19 = 0.1 mm.