Key to the species of Orybina of the world based on adults

1. Forewing with a yellow spot.............................................................................2

- Forewing without yellow spot............................................................................7

2. Forewing with yellow spot below costa....................................................................3

- Forewing with yellow spot at costa........................................................................ 4

3. Forewing with yellow spot crescent, with a silver-white spot posterolateral to yellow spot (Fig. 2)........... O. plangonalis

- Forewing with yellow spot rounded, without silver-white spot (Fig. 3)..................................... O. regalis

4. Forewing with termen distinctly convex medially, antemedial line sinuous (Fig. 1)........................... O. kobesi

- Forewing with termen obtusely arched, antemedial line straight.................................................5

5. Yellow spot on forewing about 1/3 length of costa; vein 1A+2A fuscous distally....................................6

- Yellow spot on forewing about 1/4 length of costa; vein 1A+2A pale gray (Fig. 6)........................... O. hoenei

6. Antemedial line straight, from basal 1/6 of costa to basal 2/5 of dorsum (Fig. 5).................... O. puerensis sp. nov.

- Antemedial line incurved posteriorly, from basal 1/6 of costa to basal half of dorsum (Fig. 7)................ O. flaviplaga

7. Forewing with a pale saffron spot at median area, postmedial line of forewing slightly arched medially (Fig. 8)...................................................................................................... O. imperatrix

- Forewing without saffron spot at median area, postmedial line of forewing distinctly convex medially (Fig. 4)............................................................................................... O. bellatulla sp. nov.