Voriini, Townsend

Li, Junjian, Li, Yue, Nie, Xutong & Zhang, Chuntian, 2024, One new species of Imitomyia Townsend and five newly recorded species of Dexiinae (Diptera: Tachinidae) from China, Zootaxa 5448 (1), pp. 102-116 : 103-104

Key to genera and species of tribes Voriini , Rutiliini , Imitomyiini and Dufouriini of China (Revised after Crosskey 1976 and Tschorsnig &Richter 1998)

1 Postalar callar with 4 or more strong setae. Scutellum with at least four pairs of marginal setae. Facial carina developed. Proepisternum haired. Bright yellow head in ground colour, fronto-orbital plate and lower face with pruinosity, not metallic, parafacial with yellow hairs. Thorax metallic bluish-green................... Rutiliini Rutilia (Chrysorutilia) Townsend

- Postalar callar with 2 strong setae. Scutellum with three or two pairs of marginal setae. Facial carina developed or absent. Proepisternum haired or bare............................................................................ 2

2 Prementum and labella at most as long as eye height. Arista pubescent or plumose, the longest hairs longer than basal diameter of arista. Antenna distinctly longer than height of gena........................................................ 3

- Prementum and labella strongly elongate, more than head height. Arista apparently bare or pubescent, the longest hairs about as long as basal diameter of arista. Face with a broad carina, distinctly visible in lateral view. Hairs or setulae on posteroventral half of head all black. Scutellum with only two pairs of marginal setae.............. 8 Imitomyiini Imitomyia Townsend

3 Parafacial mostly hairy, proepisternum bare, anepimeron only with hairs, without a strong seta, anatergite bare, costagial setae long and strong........................................................ Voriini Phyllomya Robineau-Desvoidy

- Parafacial bare or hairy at most on upper half............................................................... 4

4 Abdominal tergite 3 and 4 with median discal setae, syntergite 1+2 medially not excavated to hind margin. Postmetacoxcal area sclerotized. Scutellum with two pairs of marginal setae. Legs and abdomen predominantly yellow.......................................................................................... Voriini Leptothelaira Mesnil & Shima

- Abdominal tergite 3 and 4 without median discal setae. Syntergite 1+2 medially excavated to hind margin or not......... 5

5 Abdominal syntergite 1+2 medially excavated to hind margin. Lower facial margin not visible in lateral view, face without developed median carina, male with two proclinate orbital setae. Vein R 4+5 setose to crossvein R-M. Prementum and legs yellow. Mid tbia with only one anterodorsal seta................................................................................................................................. 9 Voriini Actinochaetopteryx Townsend

- Abdominal syntergite 1+2 medially not excavated to hind margin. Lower facial margin visible in lateral view............ 6

6 Face without carina, not visible in lateral view. Prementum about two times as long as its diameter. Hairs on posteroventral half of head predominantly black. Scutum with presutural acrostichal setae. R 4+5 with a few setulae at base. Hind tibia with two dorsal preapical setae. Abdominal sternites concealed between margins of abdominal tergites. Terminalia of female without spine-covered lobes.......................................................... Dufouriini Chetoptilia Rondani

- Face with a broad carina, distinctly visible in lateral view. Prementum at most as long as eye height or more than seven times as long as wide...................................................... 7 Imitomyiini ( Riedelia and Proriedelia )

7 Wing cell r 4+5 with a very long petiole. One supra-alar seta. Prementum less than head height. Postpedicel about 3 times as long as pedicel. Arista plumose. 0 presutural and 0 postsutural acrostichal seta, 2 postsutural inner-alar setae, 1 supra-alar seta................................................................................. Proriedelia petiolata Mesnil Distr. : Oriental: Myanmar.

- Wing cell r 4+5 narrowly opened, at most closed at wing margin. Two supra-alar setae. Prementum more than head height. Postpedicel 1.2–1.4 times as long as pedicel. Arista pubescent. 0 presutural acrostichal seta, 1 postsutural inner-alar seta, 1–2 supra-alar setae. Hind tibia with three dorsal preapical setae................................. Riedelia bicolor Mesnil Distr. : S. Russian Far East, China (Northeast)

8 Body length 2.3 mm. Prementum about as long as eye height, labellum about 1.2 times as long as prementum, 0 presutural and 1 postsutural acrostichal seta, 1(2) presutural and 2(3) postsutural dorsocentral setae, 1 supra-alar seta. Section of M between dm-cu and bend of M about 2.4 times as long as section between bend of M and posterior margin of wing................................................................................................ Imitomyia mica Richte r Distr.: Western Mongolia.

- Body length 2.9–4.3 mm. Prementum and labellum elongated and nearly equal length and 1.14–1.17 times of head height. 2 presutural and 2 postsutural acrostichal setae, 2 presutural and 3 postsutural dorsocentral setae, 2 supra-alar setae. Section of M between dm-cu and bend of M about 3.2–4 times as long as section between bend of M and posterior margin of wing. Abdominal tergites 3 and 4 each with a complete row of marginal setae and 1(male) or 2 (female) irregular row of slender hair-like discal setulae.................................................................. Imitomyia wangi sp.nov. Distr.: Southwestern China (NW Yunnan, near Myanmar)

9 Vein R 1 of wing with setulae dorsally.................................................................... 10

- Vein R 1 of wing bare dorsally. Head and thoracic pleura and postpronotal lobe covered with silvery white pruinosity. Genal height about 1/4 of eye height. 0–2 presutural and 1–2 postsutural acrostichal setae, 2 presutural and 4–5 postsutural dorsocentral setae. Tegula reddish yellow, basicosta reddish brown...................................... A. patellipalpis Richter Distr. : China (Inner Mongolia), Russia (Southern Far East)

10 Vein Cu 1 with setulae. Frons width of male about 1/3 of head width. Genal height about 1/5 of eye height. Antenna reddish yellow with postpedicel 2.5 times as long as pedicel. Head and thoracic pleura and postpronotal lobe covered with silvery white pruinosity.......................................................................... A. actifera Townsend Distr. : Palaearctic: China (Qinghai & Xizang). Oriental: China (West, Taiwan).

- Vein Cu 1 bare. Genal height about 1/4 of eye height. Tegula dark brown, basicosta reddish yellow. Thorax with gray pruinosity on dorsum, 0 presutural and 1 postsutural acrostichal seta...................................... A. japonica Mesnil Distr. : Palaearctic: Japan (Hokkaidō, Honshū), Russia (Southern Far East). Oriental: Taiwan.