Cyrtodiopsis concava Yang and Chen, 1996

Liu, Liqun, Wu, Hong & Yang, Ding, 2009, A review of Cyrtodiopsis Frey (Diptera, Diopsidae) from China, Zootaxa 2010, pp. 57-68 : 58-60

Cyrtodiopsis concava Yang and Chen, 1996

( Figs. 1–9 )

Cyrtodiopsis concava Yang and Chen, 1996: 466 . Type locality: Yunnan: Mengla (Menglun).

Diagnosis. Wing with central band and preapical band completely separated; large hyaline spot between central band and subapical band located outside dm-cu; apical spot very narrow. Male fore femur with distinct ventral incision at apex, fore tibia with distinct ventral process at base; fore tarsomere 1 distinctly flattened apically. Scutellar spines very long, about 4 times longer than scutellum, with 14–16 long inner setulae.

Description. Male. Body length 6.6–8.4 mm, head width (between tips of eyes) 10.1–12.5 mm, wing length 5.1–6.2 mm, wing width 1.4–1.7 mm.

Head red brown with thin pale gray pollen, except ocellar tubercle dark brown, ptilinal suture black and broad apical parts of eye stalks black brown; eyes yellow brown. Eye stalks distinctly longer than body, head width 1.3–1.5 times body length. Setulae on head dark brown; 1 pair of black inner vertical seta thin and located at middle of stalks with a weak tubercle; 1 pair of black outer vertical seta thin. Antennae red brown; arista subapical, long, black. Proboscis yellow brown with brown setulae; palpus slender, brown.

Thorax red brown, with pale gray pollen. Setulae on thorax dark brown. Scutellar spines very long and curved (1.32–1.56 mm), about 4 times longer than scutellum, black brown, with 14–16 long inner setulae; apical seta short (about 1/4 as long as spine) and black. Legs red brown except tibiae and tarsi dark brown (excluding fore tarsomeres 3–5 pale). Setulae on legs pale except tibiae and tarsi with mostly dark brown setulae. Fore femur 4.2 times longer than wide, 3 times thicker than fore tibia, with two rows of short black ventral tubercles (anterior row with 20–25 tubercles, posterior row short and 1/2 as long as anterior row with 11–18 tubercles). Male fore femur with distinct ventral incision at apex, tibia with distinct ventral process at base. Fore tarsomere 1 distinctly flattened apically. Wings hyaline with four dark brown transverse bands; central band and preapical band very large and completely separated, with large hyaline spot between them located outside dm-cu; apical band very narrow. Halter whitish.

Abdomen clavate, basally constricted, apically swollen; tergite 6 narrow and tergite 7 invisible in dorsal view. Abdomen red brown with pale gray pollen, but dorsally black apically; tergite 4 with two pale gray lateral patches at base. Male genitalia ( Figs. 6–9 ): Epandrium semiglobular with postero-lateral angle nearly obtuse in lateral view and with long setae; surstylus long, about 2.4 times longer than wide, nearly straight in lateral view. Cerci subtriangular, 2 times longer than wide, with long setae. Aedeagal apodeme with anterior arm broadening anteriorly in lateral view, 1.6 times as long as posterior arm.

Female. Body length 6.4–7.4 mm, head width 6.0– 7.3 mm, wing length 4.2–5.6 mm, wing width 1.3–1.6 mm. Similar to male, but eye stalks shorter, head width 0.9–1.0 times body length; tergite 6 wider and tergite 7 partly visible in dorsal view.

Material examined. Holotype male, CHINA: Yunnan, Xishuangbanna, Mengla, Menglun, 800 m, 11. IV. 1981, Jikun Yang. Paratypes 100 males 100 females, same as holotype; 8 males 16 females, Yunnan, Xishuangbanna, Mengla, 8. III. 1999, Ding Yang; 4 males 2 females, Yunnan, Xishuangbanna, Mengla, Wangtianshu, 1. VI. 2006, Junhua Zhang; 32 males 12 females, Yunnan, Xishuangbanna, Mengla, Menglun, 22. IV. 2007, Wenliang Li.

Distribution. China (Yunnan).

Figures

FIGURES 1 – 9. Cyrtodiopsis concava Yang et Chen, 1996. Male. 1. Head (male); 2. head (female); 3. wing; 4. fore femur; 5. scutellum; 6. epandrium and cerci, caudal view; 7. epandrium and cerci, lateral view; 8. aedeagal complex, ventral view; 9. aedeagal complex, lateral view.