Key C: Species of the Sphex bohemanni group

Females

1. Clypeus, trochanter, femora and tibiae largely ferruginous (Fig. 96) .................................................. .......................................................................................................... S. stadelmanni rufus subsp. nov.

– Clypeus and legs almost entirely black..........................................................................................2

2. Cellular wing area with yellow tinge (Fig. 93) ................................ S. pseudopraedator sp. nov.

– Cellular wing area more or less fuscous, without yellow tinge..................................................3

3. Appressed clypeal and paraocular setae black, without differently-colored luster (Figs 15–16) .....................................................................................................................................................4

– Appressed lateroclypeal and paraocular setae with silvery, golden or ferruginous luster (Figs 14, 17–18)................................................................................................................................................5

4. Free clypeal margin black; mandible black with dark ferruginous stripe only in center (Fig. 15) .......................................................................................................... S. abbotti abbotti W. Fox, 1891

– Free clypeal margin and basal half of mandible dark ferruginous (Fig. 16) ..................................... ............................................................................................ S. stadelmanni stadelmanni Kohl, 1895

5. Erect propodeal setae completely black...........................................................................................6

– Erect propodeal setae partially or entirely silvery............................................................................7

6. Free clypeal margin black; mandible black with dark ferruginous stripe only in center (Fig. 17) ........................................................................................................... S. abyssinicus (Arnold, 1928)

– Free clypeal margin and basal half of mandible dark ferruginous (Fig. 18) ................................... ............................................................................................... S. schoutedeni malawicus subsp. nov.

7. Petiole length about 2× its medial width ....................................... S. abbotti nivarius subsp. nov.

– Petiole length at most 1.7× its medial width ................. S. schoutedeni schoutedeni Kohl, 1913

Males

1. Posterior margin of sternum VII with notable incision (Figs 19–20)............................................2

– Posterior margin of sternum VII without incision (Fig. 25)............................................................4

2. Depth of incision no more than half the visible part of sternum VII (Fig. 19) ................................. ............................................................................................................. S. bohemanni Dahlbom, 1845

– Depth of incision nearly as long as visible part of sternum VII (Fig. 20).....................................3

3. Appressed and erect propodeal setae completely black (Fig. 88) ..... S. abbotti abbotti W. Fox, 1891

– Erect and sometimes appressed propodeal setae at least partially silvery (Fig. 89) ........................ ............................................................................................................ S. abbotti nivarius subsp. nov.

4. Posterior margin of sternum VIII rectangularly truncate (Fig. 25) ..... S. abyssinicus (Arnold, 1928)

– Posterior margin of sternum VIII rounded or laterally concave.....................................................5

5. Cellular wing area with yellow tinge (Fig. 93) ..................................... S. pseudopraedator sp. nov.

– Cellular wing area more or less fuscous, without yellow tinge.......................................................6

6. Fused penis valvae laterally widened and entire; valviceps oriented obliquely (Figs 21–22).........7

– Fused penis valvae laterally not widened but notched; valviceps oriented perpendicularly (Figs 23– 24)...................................................................................................................................................8

7. Clypeus and legs mostly black (Fig. 95); appressed facial setae silvery-white .............................. ............................................................................................ S. stadelmanni stadelmanni Kohl, 1895

– Lower clypeal center, trochanters, femora and tibiae largely ferruginous (Fig. 97); appressed facial setae brassy .......................................................................... S. stadelmanni rufus subsp. nov.

8. Erect propodeal setae at least partially silvery near center (Fig. 94) ............................................... ............................................................................................. S. schoutedeni schoutedeni Kohl, 1913

– Erect propodeal setae centrally black, golden at posterior margin ................................................... ............................................................................................... S. schoutedeni malawicus subsp. nov.