Key to males of eastern Nearctic Stupkaiella

1. Prothorax with a capitate patagium (Fig. 10) inserted adjacent to prothoracic spiracle on each side......................... 2

- Patagia absent .............................................................................................................................................................. 3

2(1).Gonostyli with ventral ramus approximately 2/3 as long as dorsal ramus .................................... S. mastelleri Wagner

- Gonostyli with dorsal rami elbowed basally, with a longitudinal patch of microtrichia apically (Fig. 11) ................... ....................................................................................................................................................... S. lasiostyla sp. nov.

3(1).Gonostyli with rami of subequal length ....................................................................................................................... 4

- Gonostyles with rami of unequal length ....................................................................................................................... 5

4(3).Gonocoxites with conspicuously quadrate margin dorsomedially (Figs. 12, 14), hypandrium extended posteriorly, visor-like (Fig. 14) ........................................................................................................................ S. robinsoni sp. nov.

- Gonocoxites with slightly concave margin dorsomedially, hypandrium narrow, U-shaped in dorsal view, not visor- like..................................................................................................................................................... S. furcata Vaillant

5(3). Gonocoxites with a digitiform posteromedial process about ½ as long as dorsal ramus of gonostyle ......................... ......................................................................................................................................................... S. carolina (Banks)

- Gonocoxites without posteromedial processes ............................................................................................................. 6

6(5). Dorsal paramere present, with arcuate, acuminate lateral processes (Fig. 3)...................... S. capricornuata sp. nov.

- Dorsal paramere absent, aedeagus encased by transparent parameral sheath .............................. S. recurrens Vaillant