Key to males of Necroscia Audinet-Serville, 1838 from China

1. Mesonotum with spine-like tubercles................................................................ N. mista

- Mesonotum lacking spine-like tubercles................................................................... 2.

2. Anal region of alae with mottled spots.......................................................... N. hainanensis

- Anal region of alae lacking mottled spots, uniformly coloured................................................. 3.

3. Body yellowish...................................................................................... 4.

- Body greenish....................................................................................... 5.

4. Body slender, head with ocelli................................................................. N. flavescens

- Body stout, head lacking ocelli................................................................. N. multicolor

5. Legs with markings............................................................................. N. inflata

- Legs uniformly coloured............................................................................... 6.

6. Mesonotum with brown markings................................................................ N. robustior

- Mesonotum with black markings........................................................... N. dianica sp. nov.