Key to Adult Bolshecapnia Complex Genera

1 Epiproct present on tergum 10; sternum 9 covers much of sternum 10 (Figs. 1, 31) .................................................................... Males (2)

1’ Epiproct undeveloped on tergum 10; sternum 9 not extending over sternum 10 ……. Females (4)

2 Male epiproct with a pair of curved lateral hooks (Figs. 19, 27) …..............…...... Bolshecapnia

2’ Male epiproct without curved lateral hooks (Figs. 37, 70) ………….…….................................. 3

3 Anterior margin of male tergum 9 bearing a median pair of conical knobs separated by the epiproct (Figs. 43, 45); epiproct not bent near midlength (Fig. 38) ............................... Eurekapnia

3’ Anterior margin of male tergum 9 without conical knobs (Figs. 56, 70); epiproct bent upward near midlength (Figs. 60, 71) .........................………………………. Sasquacapnia

4 Projecting tip of subgenital plate usually narrower than median part of plate (Figs. 6, 17, 34) ......................................................... Bolshecapnia

4’ Projecting tip of subgenital plate usually about as broad as median part of plate (Fig. 36) …..... 5

5 Subgenital plate rounded with a mesal notch (Fig. 66), or if truncate, then wider than long; wings without maculations ………. Sasquacapnia

5’ Subgenital plate posterior margin scarcely projecting (Fig. 35); margin rounded but without notch; wings with scattered brown maculations …..............................…..... Eurekapnia