Key to last instar nymphs of Gripopteryx (Pictet 1841) *

1 Tergum 10 with dorsal spine (Fig. 12a).................................................................... 2

- Tergum 10 without dorsal spine (Fig. 12i).................................................................. 7

2 Spine of tergum 10 ventrally curved (Fig. 12b).............................................................. 3

- Spine of tergum 10 not curved (Fig. 12f)................................................................... 5

3 Thoracic spines long (Fig. 12a)..................................................................... G. juetah

- Thoracic spines short (Fig. 12c).......................................................................... 4

4 Spine of tergum 10 longer than gills (Fig. 8 d)...................................................... G. japi n. sp.

- Spine of tergum 10 shorter than gills (Fig. 12c)......................................................... G. liana

5 Thoracic spines short (Fig. 12d).................................................................... G. pilosa

- Thoracic spines long (Fig. 12e)........................................................................... 6

6 Spines on abdominal terga 1–7 short, on 8–10 progressively longer and thicker posteriorly; pronotum with two pairs of long spines (Fig. 12e)............................................................................... G. coruja

- Spines on abdominal terga 1–8 short, on 9–10 becoming progressively longer (Fig. 12g); pronotum with a single pair of long spines......................................................................................... G. pinina

7 Pronotum relatively narrow (Fig. 12h and 12i)...................................................... G. reticulata

- Pronotum relatively wide (Fig. 12k)....................................................................... 8

8 Mature nymphs small, body length around 7 mm (Fig. 12j); color ocher................................... G. garbei

- Mature nymphs medium–sized, body length 7.8–9.4 mm (Fig. 12k and 12i); color dark brown................ G. cancellata