Macgregoromyia rectangularis, 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 : 47-49

Macgregoromyia rectangularis sp. nov.

( Figs. 11–14 , 24–27 )

Diagnosis. Antennal scape and pedicel yellowish, flagellum brown except first flagellomere yellowish basally. Wing with brownish tinge; Rs short, nearly right-angled at joint with r-m, R1+2 represented by a basal spur, paralleled with Sc2. Tergite 9 medially with a deep V-shaped incision. Lobe of gonostylus rod-like and narrowed at middle; beak of clasper of gonostylus pointed and bent downwards, basally expanded.

Description. Male. Body length 7.0 mm, wing 9.5 mm.

Head ( Figs. 12, 13 ). Rostrum short, obscure yellow, with long obscure yellow nasus. Vertex brown. Occiput brown. Orbit yellowish. Hairs on head brown. Antenna 2.5 mm long; scape and pedicel yellowish; flagellum cylindrical, brown, with first flagellomere yellowish basally, terminal flagellomere very short. Flagellum bare except first flagellomere dorsally with hairs. Labellum brown; palpus yellowish brown.

Thorax ( Fig. 12 ). General color obscure yellow. Pronotum obscure yellow; mesonotal prescutum light brown with four brownish yellow stripes, middle pair separated by a fine brown capillary, lateral border of prescutum yellow; scutum light brown, either lobe with brownish yellow stripe; scutellum light brown with middle slightly brownish yellow; mediotergite light brown with posterior margin brownish yellow. Pleura obscure yellow, anepisternum infuscate, katepisternum slightly infuscated. Legs are lacking. Coxae obscure yellow; trochanters yellow. Wing ( Fig. 14 ) with brownish tinge, wing tip more brownish, cells c and sc infuscated. Stigma yellowish brown, with white spots on both sides. Rs, r-m and Cu margined with yellowish brown. Sc1 absent, Rs short, straight before joint with r-m and nearly right-angled at joint, R1+2 represented by a basal spur, parallel to Sc2, r-m arcuate, as long as Rs, entering Rs at about 1/3 length before fork of Rs. Cell dm nearly pointed at out end, with m-m very short. Halter long, with stem obscure yellow, knob brownish yellow.

Abdomen. Ground color yellowish brown. Tergites 1–3 yellowish brown with posterior half slightly more yellowed, remain tergites brown. Sternites yellowish.

Hypopygium ( Fig. 24 ). Tergite 9 ( Fig. 25 ) brownish yellow, posterior margin medially with a deep V-shaped incision. Lobe of gonostylus ( Fig. 26 ) rod-like, slightly bent inwards and narrowed at middle, with tip rounded; clasper of gonostylus ( Fig. 27 ) with beak pointed and bent downwards, basally expanded, posterior crest rounded, basal beak very small and obtuse, posterior basal lobe emarginated.

Female. Unknown.

Type material. Holotype male, Guangxi: Xing’an, Mountain Mao’er (N 25˚51ʹ, E 110˚25ʹ, 1600 m), 28. VI. 2003, light, Xingyue Liu. Male type specimen recovered from ethanol then dry mounted on label laterally on right mid-thorax; all legs are missing.

Distribution. China (Guangxi Zhuang Autonomous Region).

Remarks. This new species is similar to M. fohkienensis Alexander, 1949 , but it can be separated from the latter in the following features: Rs straight before joint with r-m and nearly right-angled at joint; R1+2 parallel to Sc2. In M. fohkienensis, Rs is arcuated before joint with r-m and slightly bent at the joint; apex of R1+2 is touching Sc2 and closing cell sc2 ( Fig. 15).

Etymology. Name of the new species refers to the nearly right-angled Rs.

Figures

FIGURES 11 – 14. Macgregoromyia rectangularis sp. nov. 11. Habitus of male, lateral view; 12. Head and thorax, lateral view; 13. Head, dorsal view. 14. Wing.

FIGURES 24 – 27. Macgregoromyia rectangularis sp. nov. Male. 24. Hypopygium, lateral view; 25. ninth tergite, dorsal view; 26. lobe of gonostylus, lateral view; 27. clasper of gonostylus, lateral view. Scale bar of 24 – 25 = 0.2 mm, 26 – 27 = 0.1 mm.