Chlorops xinjiangensis, Cui, Yusi & Yang, Ding, 2011

Cui, Yusi & Yang, Ding, 2011, Species of Chlorops Meigen from Palaearctic China (Diptera, Chloropidae), Zootaxa 2987, pp. 18-30 : 26-28

Chlorops xinjiangensis sp. nov.

( Figs. 21–25 )

Diagnosis. Ocellar triangle yellow, smooth, main portion of triangle nearly attending to anterior margin of frons, dark brown centrally in leaf shape contended with ocellar tubercle, with a black medial sulcus and a yellow spot on each lateral margin of ocellar tubercle; ocellar tubercle black. 1st and 2nd antennal segments yellow, 3rd antennal segment nearly rounded, brownish dorsally and distally, yellow ventrally and basally; arista brown. Hypandrium relatively narrow in lateral view; pregonite as long as gonostylus, connected with hypandrium in 2 points; gonostylus broad medially and tapered anteriorly; distiphallus short, heart-like.

Description. Male. Body length 3.8 mm. Wing length 2.9 mm.

Head yellow, about 0.8 times as long as high; frons about 0.6 times as long as wide, projecting only slightly in front of eye; gena broad, nearly as high as 3rd antennal segment, vibrissal angle obtuse. Ocellar triangle yellow, smooth, main portion of triangle nearly attending to anterior margin of frons, dark brown centrally in leaf shape contended with ocellar tubercle, with a medial black sulcus and a yellow spot on each lateral margin of ocellar tubercle; ocellar tubercle black. Setae on head black, setulae yellow. Oc proclinate and divergent; vte and vti weak. Eyes bare. 1st and 2nd antennal segments yellow, 3rd antennal segment nearly rounded, brownish dorsally and distally, yellow ventrally and basally; arista brown. Proboscis yellow with yellow setulae; palpus yellow with pale setulae.

Thorax nearly as wide as head, yellow. Thoracic pleuron shinning yellow except for region below prothoracic spiracle with a black spot; anteroventral region of anepisternum with a black spot; anepimeron with a faint yellowbrown spot on anteroventral region; katepisternum with black lower portion; katepimeron with a black spot on lower margin, covered with tiny pale setulae; postnotum black; scutum nearly as long as wide, covered with short setulae and pale pollen, with 5 black stripes; scutellum yellow, about 2.0 times as wide as long. Setae and setulae on thorax black. Legs long and thin, yellow, except for tarsomere 5 brown. Wing hyaline, veins brown. Relative lengths of costal sections 2nd: 3rd: 4th = 20: 25: 15. Squama yellow with yellow setulae. Halteres bright yellow.

Abdomen yellow. Each tergum with obscure brown anterior margin and narrow brown posterior margin. Setulae on abdomen black.

Male genitalia ( Figs. 23–25 ): epandrium yellow, with black setulae, and also with a translucent triangular process ventrally; surstylus short, less than 0.5 times as high as epandrium, with posterior region hook-like, curved forward, dark, with tiny process; mesolobus with 2 pairs of setulae; hypandrium relatively narrow in lateral view; pregonite as long as gonostylus, connected with hypandrium in 2 points; gonostylus broad medially and tapered anteriorly; distiphallus short, heart-like.

Female. Body length 4.0 mm. Wing length 3.0 mm. Similar to male.

Type material. Holotype 3, CHINA: Xinjiang, Gongnaisi, 20. VII. 2005, Jianxin Cui. Paratypes Ƥ, same as holotype; Ƥ, same locality as holotype, 20. VII. 2005, Xiaoshuan Bai.

Distribution. China (Xinjiang).

Remarks. The new species is somewhat similar to Chlorops zernyi Duda, 1932 from Europe, Japan, and west & central Siberia in the ocellar triangle yellow, smooth, dark brown centrally in leaf shape, contended with the ocellar tubercle; and the gena broad, nearly as high as the 3rd antennal segment. But it can be separated from the latter by the 3rd antennal segment brownish dorsally and distally, yellow ventrally and basally; the arista brown; the katepisternum with the black lower portion; and the pregonite connected with the hypandrium in 2 points. In C.

zernyi Duda , the 3rd antennal segment is black entirely; the arista is white; the katepisternum has the reddish-yellow lower portion; and the pregonite is broadly attached to the hypandrium anteriorly ( Kanmiya, 1978). Etymology. The species is named after the type locality Xinjiang.

Figures

FIGURES 21 – 25. Chlorops xinjiangensis sp. nov. Male. 21. Head, dorsal view; 22. antenna, lateral view; 23. epandrium, posterior view; 24. epandrium, lateral view; 25. hypandrium and phallic complex, ventral view. Scale bar of 21 = 0.50 mm, 22 = 0.33 mm, 23 – 24 = 0.25 mm, 25 = 0.22 mm.