Key to the species of Sternitta based on male genitalia

1. Ampullae smoothly rounded apically...................................................................... 2

- Ampullae not rounded apically.......................................................................... 4

2. Editum thumblike; anellus with a large spinelike process...................................................... 3

- Editum absent; anellus with a quadrangular plate and small crests apically.................... S. parasuffuscalis (Fig. 5)

3. Dorsum of ampullae triangular; phallus slightly curved at distal 1/5.................... S. mondulkiriensis sp. n. (Fig. 7)

- Dorsum of apmpullae bearing a thumblike and setose process; phallus strongly curved into a fishhook-shaped................................................................................................ S. suffuscalis (Fig. 6)

4. Phallus S-shaped; digitus club-shaped........................................................ S. hackeri (Fig. 8)

- Phallus strongly curved or subapically upturned; digitus triangular or tapered...................................... 5

5. Ampullae divided into two parts; phallus slightly upturned subapically........................................... 6

- Ampullae not divided into two parts; phallus strongly upturned................................................. 7

6. Digitus slightly curved; anellus strongly arched dorsally........................................ S. gabori (Fig. 11)

- Digitus not curved; anellus weakly arched dorsally............................................. S. magna (Fig. 12)

7. Ampullae with 3 processes apically, outer-ventral surface with a sticklike process; right process triangular, about half as long as left.............................................................................. S. gregerseni (Fig. 9)

- Ampullae slightly concave apically, outer-ventral surface without a sticklike process; right process sticklike, about 3/4 as long as left................................................................................ S. goateri (Fig. 10)