Ensiferella

Liu, Xiaoyan & Yang, Ding, 2012, Species of the genus Ensiferella Andersson from China, with a key to world species (Diptera, Chloropidae), Zootaxa 3207, pp. 54-62 : 55

Key to the species of genus Ensiferella

1. Ocellar triangle occupying entire frons with broad anterior apex, brown, brilliant with blue-green or multicolored metallic shimmer.................................................................................................... 2

- Ocellar triangle with almost parallel posterior side margins and pointed anterior apex, black without metallic shimmer. If the front part of ocellar triangle rounded, then ocellar triangle yellow, shiny.......................................... 6

2. Scutum yellow with black marking; thoracic pleuron shiny, yellow with black spots................................. 3

- Scutum shiny black or brown with yellow or black strips; thoracic pleuron black, only katepisternum maybe with a yellow spot................................................................................................ 4

3. Scutum with large black marking, yellow spot anterior to scutellum nearly square, distal margin flat...................................................................................................... E. ceylonica Andersson

- Scutum with 3 broad black stripes, which are fused with each other entirely on distal half of scutum, yellow spot anterior to scutellum not square, distal margin emarginated............................................. E. shibuyai Kanmiya

4. Scutellum black; thoracic pleuron without yellow spot......................................... E. iridifrons (Frey)

- Scutellum yellow; thoracic pleuron with a yellow spot on katepisternum......................................... 5

5. Proboscis black; surstylus connected with epandrium, surstyllar apodeme with a long bifurcation attached to inner fork of hypandrium distally.................................................................... E. formosa (Becker)

- Proboscis yellow; surstylus not connected with epandrium, spinous processes on inner lateral margin elongate and incurved..................................................................................... E. longispina sp. nov.

6. Ocellar triangle yellow with broad anterior apex; palpus yellow; scutum yellow with 3 shiny black stripes.................................................................................................... E. vittiger (Malloch)

- Ocellar triangle black with pointed anterior apex; palpus black; scutum black or yellow with 3 shiny black stripes......... 7

7. Scutellum entirely black................................................................................ 8

- Scutellum brown except middle 1/3 yellow................................................................ 10

8. Ocellar triangle with a pronounced in-depth medial groove; abdomen entirely brown; fore femur black except distal portion yellow.............................................................................................. 9

- Ocellar triangle without medial groove; abdomen partly yellow; fore femur entirely yellow.......... E. gladiolus (Becker)

9. Abdomen brown, tergites 1–3 with a large triangular yellow spot; surstylus spoon-shaped, basally broad, round............................................................................................... E. kanmiyai Nartshuk

- Abdomen shiny black, basal portion with a small bright spot; surstylus with a claw, directed to midline..................................................................................................... E. obscurella (Becker)

10. Fore tibia and tarsus yellow, except fore tarsomeres 4–5 brown; cercus nearly square; postgonite distinctly incurved distally with pointed apex.................................................................... E. sabroskyi Nartshuk

- Fore tibia and tarsus entirely brown; cercus semicircular; postgonite slightly incurved distally with blunt apex.................................................................................................. E. elongata sp. nov.