Key to species of Ypsolopha albiramella -group based on external characters

1. Forewing with ground colour different on anterior half and posterior half........................................ 2

- Forewing with ground colour uniform.................................................................... 3

2. Anterior half of forewing whitish brown (Fig. 27)........................................... Y. allochroa sp. nov.

- Anterior half of forewing gray (Fig. 33)........................................................ Y. contractella

3. Forewing with a pale streak along middle of cell (Fig. 26)....................................... Y. minuta sp. nov.

- Forewing without streak along middle of cell.............................................................. 4

4. Forewing with strips along veins........................................................................ 5

- Forewing without strips along veins..................................................................... 6

5. Forewing with white strips along veins (Fig. 28).................................................. Y. albiramella

- Forewing with dark strips along veins (Fig. 32).................................................. Y. altissimella

6. Wing expanse more than 23.0 mm (Fig. 31)............................................. Y. longifloccosa sp. nov.

- Wing expanse less than 17.0 mm........................................................................ 7

7. Forewing ground colour yellowish white (Fig. 29)..................................................... Y. helva

- Forewing ground colour pale brown (Fig. 30).............................................. Y. brevivalva sp. nov.