Checklist of the Asian Species of Orbellia:

1. O. amurensis Gorodkov, 1972

2. O. fusca sp. nov.

3. O. montana Gorodkov, 1972

4. O. tetrachaeta Gorodkov, 1972

5. O. tokyoensis Czerny, 1937

6. O. zaitzevi Gorodkov, 1972

7. O. zhangi sp. nov.

Based on the distribution records in Catalogue of Palaearctic Diptera, Vol. 10 (Gorodkov, 1984) for the family Heleomyzidae, O. montana and O. tetrachaeta are recorded from Russia, including the Caucasus region.Additionally, O. zaitzevi is reported from Bakuriani, Georgian, Transcaucasia. These areas lie within the Caucasus, which serves as a natural boundary between Asia and Europe. Specifically, modern-day Georgia, located in the southern part of the Caucasus, is geographically situated in Asia, even though it has historically been seen as a transitional zone between the two continents.

Key to the Asian species of Orbellia

1. Scutellum with 2 pairs of scutellar setae................................................................... 2

- Scutellum with 3 pairs of scutellar setae................................................................... 4

2. Palpus colored pale, not darkened................................................... O. zaitzevi Gorodkov, 1972

- Palpus darkened...................................................................................... 3

3. First flagellomere yellowish; legs yellow.......................................... O. tetrachaeta Gorodkov, 1972

- First flagellomere dark brown; legs mostly brownish............................................ O. fusca sp. nov.

4. Palpus mostly light in color, not darkened................................................................. 5

- Apex of palpus darkened or uniformly yellowish brown...................................................... 6

5. Basal width of surstylus approximately 2.0 times middle width; phallus with 8 spines in middle portion............................................................................................. O. amurensis Gorodkov, 1972

- Basal width of surstylus approximately 3.0 times middle width; phallus with a row of 14 short stout finger-like structures in middle portion …....................................................................... O. zhangi sp. nov.

6. Apex of surstylus not narrowed..................................................... O. tokyoensis Czerny, 1937

- Apex of surstylus gradually narrowed............................................... O. montana Gorodkov, 1972