Four new species of the genus Delia Robineau-Desvoidy in the Yunnan Province of China (Diptera, Anthomyiidae)

Abstract Four new species of the genus Delia from Yunnan Province are described: Delia dentiaedeagus sp. n., Delia longiabdomina sp. n., Delia nigerihalteres sp. n., and Delia tuberisurstyla sp. n. A catalogue of all Delia species recorded from Yunnan Province has also been included.

There are 103 species distributed in China, among which 12 are located in Yunnan Province. Yunnan is one of the most diverse places in China: its complex and varied terrains and landforms as well as the different climates have created a natural paradise for biodiversity. After several collecting periods, four new species were found. This paper includes a complete report on these new species and a full catalogue of all species distributed in Yunnan Province.

Materials and methods
All specimens were collected from Yunnan Province of China. Type specimens are deposited in the Diptera collection of the Institute of Entomology, Shenyang Normal University (IESNU). Diagnosis. Arista short ciliated, longest hairs shorter than its basal diameter; legs black; mid tarsomere 1 with long ad; processes of 5th sternite slender, with long and dense setae, without spine or protrusion.

Abbreviations used in the descriptions
Description. Holotype Male. Body length 4.5-5.0 mm. Head. Eye bare; frontal vitta dark brown without interfrontal setule; fronto-orbital plate adjacent; frons as wide as anterior ocellus; without orbital setae; fronto-orbital plate and parafacial with grey dust; 5-6 pairs of frontal setae, situated on lower half of frons; parafacial subequal to the width of antenna; antenna black, postpedicel approx. 2.2-2.5 times longer than broad; arista short ciliated, longest hairs shorter than its basal diameter; lower facial margin not projecting, situated behind frontal angle in profile; genal height approx. 1/5 eye height; anterior margin of gena with one row of upcurved subvibrissal setulae; prementum black, without dust, approx. 3.5 times longer than broad; palpus black, slightly shorter than prementum. Thorax. Black in ground colour, with grey to brownish grey dust; scutum with three black vittae, the middle one extended to scutellar suture; prst acr two rows, only one pair of post acr developed which are placed in front of scutellum, dc 2+3, ial 0+2; notopleural despression bare apart from two strong setae; pra as long as posterior notopleural; scutellum bare on disc centrally and basally; katepisternals 1+2.
Legs. Entirely black; fore tibia with one medial p; mid femur without distinct av row, a row of seta-like pv in basal half, only two setae in basal developed; mid tibia without av or ad, two pd and two pv; mid tarsomere 1 with distinct ad; hind femur with 2-3 av and 2-3 pv in distal part; hind tibia with four av, three ad, three pd, and 5-6 pv in middle part, without apical pv; hind tarsi longer than tibiae, all claws and pulvilli normal, slightly shorter than tarsomere 5.
Abdomen. Black, rhombic in dorsal view, with grey to brownish dusting; all tergites with black vittae in middle part; dorsal setae sparse, lateral setae long; 6 th tergite bare; 1 st sternite with setae.
Female. Unknown. Fan et al., 1984, but differs from it in the following features: male frontal vitta dark brown; fronto-orbital plate adjacent; parafacial subequal to the width of antenna; prementum 3.5 times longer than broad; basicosta black; haltere yellowish; hind tibia with four av, three ad and 5-6 pv in middle part.

Remarks. This new species is similar to Delia felsicanalis Fan & Wu in
Etymology. The species name is derived from the Latin words "dent" meaning tooth and "aedeagus" meaning aedeagus, referring to its apical aedeagus with tooth.
Thorax. Black in ground colour with dark green lustre and dark grey dust; scutum with three indistinct black vittae, the middle one absent; two rows of hair-like prst acr (1 or 2 pairs stronger), only one pair of post acr developed, these situated in front of scutellum, dc 2+3, ial 0+2, with one pair of outer posthumeral setae; notopleural despression bare apart from two strong setae; pra subequal to posterior notopleural; scutellum bare on disc centrally and basally; katepisternals 1+2 (3).
Legs. Entirely black; fore tibia with one medial p; mid femur with seta-like a row in basal half, pv rows complete, becoming shorter apically; mid tibia with two p, one long pd and 1-2 short pv; mid tarsomere 1 with one row of long pd, longer than its diameter; hind femur with complete row of av, becoming longer apically, with two apical pv; hind tibia with 8-10 av, 5-6 ad, one row of pd (4 developed), and one row of pv, similar as Delia platura (Meigen, 1826); all tarsi shorter than tibiae, claws and pulvilli large.
Abdomen. Black, long flat-shaped in dorsal view, with grey dust; all tergites with broad black vittae in middle part, the front margin slightly dark, edge unclear; lateral and post marginal setae long; 6th tergite bare; 1st sternite densely with long setae; 3 rd and 4 th sternites without dense long setae.
Remarks. This new species is similar to Delia subnigribasis Fan & Wang in Fan et al., 1981, but differs from it in the following features: male frontal setae 6-7 pairs; pra subequal to posterior notopleural seta; inner side of 5th sternite processes broad apically; cercus broad apically, surstylus broad and straight in dorsal view, straight in lateral view, becoming slender apically.
Etymology. The species name is derived from the Latin words "long" meaning long, referring to its very long abdomen.
Thorax. Black in ground colour with brownish grey dust; scutum with three black vittae; two rows of hair-like prst acr (the second pair stronger), only one pair of post acr developed, these situated in front of scutellum, dc 2+3, ial 0+2; notopleural despression bare apart from two strong setae; pra subequal to the posterior notopleural; scutellum bare on disc centrally and basally; katepisternals 1+2.
Legs. Entirely black; fore tibia with one medial p; mid femur with a complete row of av, becoming shorter apically, a complete row of pv, becoming longer medially; mid tibia with 2-3 pd and two pv; mid tarsomere 1 with row of long pd, subequal to the length of its diameter; hind femur with complete row of av and pv, becoming longer mediately; hind tibia with five av, 5-6 ad, 2-3 pd, and 8-9 pv; all tarsi shorter than tibiae, claws slightly longer than pulvilli, pulvilli approx. 1/2 length of tarsomere 5.
Abdomen. Black, flat cone-shaped in dorsal view; all tergites with broad trapeziform spots in centre, posterior marginal setae and lateral setae strong; 6 th tergite bare; 1 st sternite with fine hairs.

Female. Unknown.
Remarks. This new species is similar to Delia quadrilateralis Fan & Zhong in Fan et al., 1981, but differs from it in the following features: male frontal vitta 1.5 times as wide as fronto-orbital plate; frons 1.5 times wider than anterior ocellus; basicosta black; costal spine absent; squamae brown; halter black; mid tarsomere 1 with row of long pd, subequal to the length of its diameter.
Etymology. The specific name is from the Latin word "niger", black, "halter", halter, referring to its black halter.
Description. Holotype male. Body length 5.5-6.0 mm. Head. Eye with sparse and short ciliae; frontal vitta black, with black dust; frontal vitta with a pair of interfrontal setule; frons as wide as anterior ocellus; without orbital setae; fronto-orbital plate, parafacial and gena with dark grey dust; 7-8 pairs of frontal setae, situated on lower half of frons; parafacial 1.4 times wider than postpedicel; antenna black, postpedicel 1.5 times longer than broad; arista pubescence, longest hairs shorter than its basal diameter; lower facial margin slightly projecting, with anterior margin of frons in same vertical plane; genal height approx. 2/7 eye height; anterior margin of gena with two rows of upcurved subvibrissal setulae; para-occipital and postgenal hairs black; proboscis slender, prementum with grey dust, approx. 6.0-7.0 times longer than broad; palpus black, subequal to prementum.
Thorax. Black in ground colour with dark grey dust; scutum with three indistinct black vittae; two rows of hair-like prst acr (1 or 2 pairs stronger), only one pair of post acr developed, these situated in front of scutellum, dc 2+3, ial 0+2; notopleural despression bare apart from two strong setae; pra 1.2 times longer than posterior notopleural seta; scutellum bare on disc centrally and basally; katepisternals 1+2.
Legs. Entirely black; fore tibia with 1(0) medial p; mid femur with seta-like a row in basal half, pv rows complete; mid tibia with one pd and two pv; mid tarsomere 1 with one row of long ad, more than 1.5 times longer than its diameter; hind femur with complete row of av, becoming longer apically; hind tibia with 9-10 av, 5-6 ad, one row of pd (3-4 developed), and two rows of pv, slightly pectinated; all tarsi shorter than tibiae, claws and pulvilli large, slightly shorter than tarsomere 5. Abdomen. Black, long cone-shaped in dorsal view, with grey or brownish grey dust; all tergites with hair-like setae in middle part, setae becoming longer towards lateral margin, mid black vitta expand in middle part, near rhombic; 6 th tergite bare; 1 st sternite dense with long fringes.

Remarks.
This new species is similar to Delia subnigribasis Fan & Wang in Fan et al., 1981, but differs from it in the following features: male frontal setae 7-8 pairs; pra 1.2 times longer than posterior notopleural seta; basicosta black; mid tarsomere 1 with one row of long ad, more than 1.5 times longer than its diameter.
Etymology. The species name is derived from the Latin words "tuber", tuber, referring to the middle part of surstylus with a sheet-shaped tuber in dorsal view.