Microdontinae, Rondani, 1845

Tian, Jing, Huo, Ke-Ke, Zhang, Chun-Tian & Ren, Bing-Zhong, 2019, Microdon dentigiganteum sp. nov. and other Microdontinae species (Diptera: Syrphidae) from Northeast China, Zootaxa 4712 (1), pp. 65-76 : 72

Key to the Microdontinae species of Northeast China

1 Propleuron only with microtrichia..................................................... Metadon spuribifasciatus

- Propleuron with microtrichia and pile..................................................................... 2

2 Scutellum without calcars ( Figs 6C, D ).................................................................... 3

- Scutellum with calcars ( Figs 3E , 6A )...................................................................... 4

3 Legs brownish black to black, mostly black pilose; abdomen black with cupreous metallic hues ( Fig. 8C ) Microdon auricomus

- Legs brownish black to black, basal 1/2 brownish yellow, yellow pilose; abdomen black ( Fig. 8D )........ Microdon ignotus

4 Calcars of scutellum huge, conspicuously longer than 1/2 of the scutellum length ( Fig. 3E ) Microdon dentigiganteum sp. nov.

- Calcars of scutellum relatively small, shorter than 1/5 of the scutellum length ( Figs 6B, 6E ).......................... 5

5 Antennal ratio approximately 4.1: 1: 3.6 ( Fig. 5B ); vertex and frons black, yellow pilose; abdomen black ( Fig. 8B )................................................................................................ Microdon analis

- Antennal ratio approximately 2.9: 1: 2.2 ( Fig. 5F ); vertex and frons black, mostly black pilose; abdomen black with cupreous metallic hues ( Fig. 8E ).................................................................... Microdon oitanus

Figures

FIGURE 3. Microdon dentigiganteum Tian, Huo et Zhang, sp. nov. (A) Male head, lateral view; (B) Male head, dorsal view; (C) Female head, frontal view; (D) Female head, dorsal view; (E) Male scutellum; (F) Male antenna, dorsal view; (G) Wing; (H) Apex part of wing.

FIGURE 5. Antennae of adult Microdontinae from Northeast China. (A) Metadon spuribifasciatus, female; (B) Microdon analis, male; (C) Microdon auricomus, female; (D) Microdon dentigiganteum sp. nov., male; (E) Microdon ignotus, male; (F) Microdon oitanus, male. Scale bar: 1mm.

FIGURE 6. Scutellaof adult Microdontinae from Northeast China. (A) Metadon spuribifasciatus, female; (B) Microdon analis, male; (C) Microdon auricomus, female; (D) Microdon ignotus, male; (E) Microdon oitanus, male. Scale bar: 1mm.

FIGURE 8. Abdomens of adult Microdontinae from Northeast China, dorsal view. (A) Metadon spuribifasciatus, female; (B) Microdon analis, male; (C) Microdon auricomus, female; (D) Microdon ignotus, male; (E) Microdon oitanus, male. Scale bars: 5mm.