Cyrtodiopsis pseudoconcava, Liu, Liqun, Wu, Hong & Yang, Ding, 2009

Liu, Liqun, Wu, Hong & Yang, Ding, 2009, A review of Cyrtodiopsis Frey (Diptera, Diopsidae) from China, Zootaxa 2010, pp. 57-68 : 60-62

Cyrtodiopsis pseudoconcava sp. nov.

( Figs. 10–17 )

Diagnosis. Wing with central band and preapical band completely separated; large hyaline spot between central band and preapical band located inside dm-cu; apical spot rather wide. Male fore femur with weak ventral incision at apex, tibia with weak ventral process at base; fore tarsomere 1 apically distinctly flattened. Scutellar spines long, about 2.5 times longer than scutellum, with 5–6 long inner setulae. Abdominal tergites 3–4 each with two yellow brown lateral patches at base.

Description. Male. Body length 5.0– 6.8 mm, head width 5.3–7.4 mm, wing length 4.0– 5.4 mm, wing width 1.2–1.3 mm.

Head red brown with thin pale gray pollen, except ocellar tubercle brown, ptilinal suture black and broad apical parts of eye stalks black brown; eyes yellow brown. Eye stalks slightly longer than body, head width 1.1–1.2 times body length. Setulae on head and eye stalks mostly short and brownish. 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 slightly thin. Antennae dark brown; arista subapical, long, black. Proboscis yellow brown with brown setulae; palpus slender, brown.

Thorax dark red brown with pale gray pollen. Setulae on thorax brownish; scutum with long sparse setulae. Scutellar spines long and curved (0.99–1.12 mm), about 2.5 times longer than scutellum, black brown, with 5–6 dark brown long inner setulae; apical seta short, black. Legs red brown except fore tibia and tarsus black brown with tarsomeres 3–5 yellow brown, apical 1/4 of mid and hind femora and entire mid and hind tibiae and tarsi dark red brown. Setulae on legs brown; femora with long setulae. Fore femur moderately thickened, 4.5 times longer than wide, about 2.8 times thicker than fore tibia, and with two rows of short black ventral tubercles (anterior row with 18–23 tubercles, posterior row short and about 1/2 as long as anterior row with 7–10 tubercles). Male fore femur with ventral incision at apex, tibia with ventral process at base. Fore tarsus flattened dorso-ventrally, with fore tarsomere 1 apically distinctly flattened (distinctly wider than tarsomere 2). Wings hyaline with four dark brown transverse bands; central band and preapical band completely separated, with only large hyaline spot between them located inside dm-cu, apical spot rather wide; veins dark brown. 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; tergites 3–4 each with two yellow brown lateral patches at base. Setulae on abdomen long and brownish.

Male genitalia ( Figs.14–17 ): Epandrium semiglobular with postero-lateral angle nearly obtuse in lateral view and without long setae; surstylus long, 3.2 times longer than wide, nearly straight in lateral view. Cerci subtriangular, 1.6 times longer than wide, with long setae. Aedeagal apodeme with anterior arm broadening anteriorly in lateral view, 1.5 times as long as posterior arm.

Female. Body length 4.6–5.3 mm, head width 3.9–4.8 mm, wing length 3.4–4.5 mm, wing width 1.0– 1.3 mm. Similar to male, but eye stalks shorter, head width 0.8–0.9 times body length; tergite 6 wider and tergite 7 partly visible in dorsal view; fore tarsomeres 2–5 pale, fore tarsomere 1 not flattened.

Type material. Holotype male, CHINA: Yunnan, Xishuangbanna, Mengla, 8. III. 1999, Ding Yang. Paratypes 8 males 16 females, same as holotype; 2 males 2 females, Yunnan, Xishuangbanna, Mengla, Wangtianshu, 1. VI. 2006, Junhua Zhang; 7 males 7 females, Yunnan, Xishuangbanna, Mengyang, Yexianggu, 27. V. 2006, Junhua Zhang; 9 males 12 females, Yunnan, Xishuangbanna, Mengla, Menglun, 17. III. 1999, Ding Yang.

Distribution. China (Yunnan).

Remarks. The new species is similar to Cyrtodiopsis concava Yang et Chen, 1996 , but it can be separated from the latter by the following characters: wing with hyaline spot between central band and subapical band located inside dm-cu, apical spot rather wide; scutellar spine long, with 5–6 long inner setulae; abdominal tergites 3–4 each with two yellow brown lateral patches at base; epandrium without long setae. In Cyrtodiopsis concava , the hyaline spot of the wing between the central band and subapical band is located outside dm-cu, the apical spot is very narrow; the scutellar spines are very long with 14–16 long inner setulae; only the abdominal tergite 4 has two pale gray lateral patches at base; the epandrium has the long setae ( Yang & Chen, 1996).

Etymology. The species name refers to Cyrtodiopsis concava Yang et Chen, 1996 , to which the new species is similar.

Figures

FIGURES 10 – 17. Cyrtodiopsis pseudoconcava sp. nov. Male. 10. Head; 11. wing; 12. fore femur; 13. scutellum; 14. epandrium and cerci, caudal view; 15. epandrium and cerci, lateral view; 16. aedeagal complex, ventral view; 17. aedeagal complex, lateral view.