Key to the pupae of Neotropical Nilothauma Kieffer

1. Thoracic horn with 5–6 branches; tergite VII with anterior and posterior shagreen patches or only posterior shagreen patch; tergite VIII with anterior and posterior shagreen patches. ................................................................................ 2

- Thoracic horn with 8 branches; tergites VII–VIII with anterior shagreen patches only (Soponis 1987: 15, Figs 6–11). ............................................................................................................................ Nilothauma reissi (Soponis) comb. n.

2. Tergite VIII with anterior and posterior patches of shagreen connected ..................................................................... 3

- Tergite VIII with anterior patch of shagreen completely separated from posterior patch (Wiedenbrug 2000: 248, Fig. 96) ................................................................................................................ Nilothauma -complex spec. 1 Wiedenbrug

3. Tergite VIII with anterior and posterior patches of shagreen connected by narrow band of fine shagreen. ............... 4

- Tergite VIII with anterior and posterior patches of shagreen completely fused (Figs 45–48). ..................................... ................................................................................................................................... Nilothauma matogrossense sp. n.

4. Tergite VII with anterior and posterior patches of shagreen connected by narrow band of fine shagreen (Figs 75–79). ............................................................................................................................................................ Nilothauma sp. 1.

- Tergite VII with posterior patch of shagreen only (Figs 13–16). ................................. Nilothauma aripuanense sp. n.