Key to species of the Orasema festiva group

Males are unknown for O. alvarengai, O. festiva, and O. reburra, but based on the other species features appear to be valid for both sexes.

1. Eye with long setae (Fig. 7)......................................................... Orasema caesariata n. sp.

- Eye without visible setae at 50× magnification (Figs 3, 11, 18, 22, 27)............................................ 2

2. Coxae dark brown (Figs 26, 29). Petiole with many (>10) long setae (Fig. 29).................... Orasema reburra n. sp.

- Coxae yellow (Figs 2, 5, 12, 21, 24). Petiole bare (Figs 5, 14, 21, 24), or with few (<5) very tiny decumbent setae are not easily visible at 50x magnification (Fig. 5)....................................................................... 3

3. Petiole parallel-sided in dorsal view, smooth and without a dorsal longitudinal carina (Fig. 24).... Orasema festiva (Fabricius)

- Petiole laterally expanded near midlength, with some dorsal sculpture and/or dorsal longitudinal carina (Figs 5, 14, 21).....4

4. Petiole only slightly laterally expanded near midlength: at least 3.5× as long as broad in both sexes (Fig. 21)................................................................................................. Orasema erwini n. sp.

- Petiole more strongly laterally expanded near midlength: not more than 2.8× as long as broad in females (Figs 5, 14), 3.27× as long as broad in males.................................................................................. 5