Key to species of Sigalopella gen. n.

1. Femora black (Figs 6–8)............................................................. S. nigrofemoralis sp. n.

– Femora yellow (Fig. 1)................................................................................ 2

2. Abdomen orange basally (laterally on segments 1–2 and sometimes segment 3) (Figs 3 –5)............ S. armeniaca sp. n.

– Abdomen uniform black (Figs 1, 12)..................................................................... 3

3. Scape narrow, much longer than head length, most macrosetae filamentous regardless of size; flagellum longer and sub-cylindrical along most of length; face distinctly bulbous and shiny (Figs 9–13)....................... S. rufifemoralis sp. n.

– Scape thicker, only slightly longer than head length, larger macrosetae shorter and more robust dorsally and laterally; flagellum shorter and more tapered; face raised but more broadly rounded (Fig. 1–2) (male unknown).......... S. ammophila sp. n.