Macgregoromyia flatusa, 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 : 44-47

Macgregoromyia flatusa sp. nov.

( Figs. 6–10 , 20–23 )

Diagnosis. Antennal scape yellowish brown, pedicel brownish yellow. Wing light yellowish, with Rs angled at middle. Posterior margin of tergite 9 medially with a shallow U-shaped incision. Lobe of gonostylus rod-like, slightly narrowed to tip; clasper of gonostylus with beak obtuse, dorsal crest flat, posterior crest right-angled.

Description. Male. Body length 9.0 mm, wing 10.0 mm.

Head ( Fig. 7, 8 ). Rostrum short, yellowish brown, with nasus. Vertex dark brown. Occiput dark brown. Hairs on head brown. Scape yellowish brown; pedicel brownish yellow; flagella are lacking. Labellum dark brown; palpus dark yellowish brown.

Thorax ( Fig. 9 ). General color reddish brown. Pronotum reddish brown; mesonotal prescutum maroon with three dark brown stripes; scutum dark brown; scutellum brown; mediotergite dark brown. Pleura maroon with grayish pruinescence. Legs are lacking except one leg. Coxae maroon; trochanters maroon. Femur yellowish brown with tip brownish; tibia yellowish brown; tarsus yellowish brown. Wing ( Fig. 10 ) light yellowish, with cells c and sc yellow. Stigma yellowish brown. Area around fork of Rs yellowish brown. Sc1 absent, R1+2 entire, Rs short, oblique, angled at middle, nearly as long as r-m, r-m straight, entering Rs short before fork of Rs. Halter with stem yellow, knob dark brown.

Abdomen. Ground color dark brown. Tergites dark brown with posterior half yellowish brown. Sternites dark brown.

Hypopygium ( Fig. 20 ). Tergite 9 ( Fig. 21 ) black, posterior margin medially with a shallow U-shaped incision. Lobe of gonostylus ( Fig. 22 ) rod-like, slightly narrowed to tip; clasper of gonostylus ( Fig. 23 ) with beak obtuse, dorsal crest flat, posterior crest right-angled, basal beak obtuse, posterior basal lobe emarginated.

Female. Unknown.

Type material. Holotype male, Hubei: Shennongjia, Songbai (N 31˚45ʹ, E 110˚40ʹ, 900 m), 29. V. 1984, Jikun Yang. Male type specimen pinned dorso-ventrally through left mid-thorax; all but left hind leg are missing.

Distribution. China (Hubei).

Remarks. This new species is similar to M. brevisector Alexander, 1931 , but it can be separated from the latter in the following features: CuA1 meeting M3 at a point; posterior margin of tergite 9 with a shallow U-shaped incision; dorsal crest of clasper of gonostylus flat. In M. brevisector , the vein CuA1 is fused with M3 for a short distance; the posterior margin of tergite 9 has a deep U-shaped notch; the dorsal crest of the clasper of the gonostylus is convex ( Alexander 1931).

Etymology. Name of the new species refers to the flat dorsal crest of the clasper of gonostylus.

Figures

FIGURES 6 – 10. Macgregoromyia flatusa sp. nov. 6. Habitus of male, dorsal view; 7. Head, dorsal view; 8. Head, lateral view; 9. Thorax, lateral view. 10. Wing.

FIGURES 20 – 23. Macgregoromyia flatusa sp. nov. Male. 20. Hypopygium, lateral view; 21. ninth tergite, dorsal view; 22. lobe of gonostylus, lateral view; 23. clasper of gonostylus, lateral view. Scale bar of 20 – 21 = 0.2 mm, 22 – 23 = 0.1 mm.