Key G: Species of the Sphex umtalicus group

1. Male: appressed clypeal setae black ........................................................................ S. hades sp. nov.

– Male: appressed clypeal setae silvery...............................................................................................2

2. Wings with distinct green iridescence; erect propodeal setae entirely black (Fig. 63). 26–32 mm long .......................................................................................................... S. caeruleanus Drury, 1773

– Wings with violet or blue iridescence, or without any. If greenish, then erect propodeal setae at least partially silvery (Figs 64–65). Smaller.......................................................................3

3. Female: erect setae at posterior propodeal margin silvery (Fig. 64). Male: free clypeal margin ferruginous or black; erect propodeal setae largely silvery (Fig. 65); broad placoids cover entire length of at least flagellomeres V and VI ............. S. mweruensis (Arnold, 1947)

– Female: erect propodeal setae uniformly black (Figs 69, 72–73). Male: free clypeal margin black; erect propodeal setae black, if silvery then placoids narrow...............................................4

4. Female: clypeus black (Fig. 33), at most lower half ferruginous; legs black, rarely ferruginous (Fig. 72); appressed clypeal setae dark brown; appressed lateroclypeal and paraocular setae without ferruginous-golden luster (Fig. 33); at most basal half of flagellomere I ferruginous. Male: legs black or dark ferruginous, or rarely all tibiae and most of mid- and hindtarsi ferruginous; basal half of mandible black or ferruginous; mesosomal vestiture uniformly black ................... ............................................................................................................. S. umtalicus Strand, 1916

– Female: clypeus and legs largely ferruginous, if clypeus predominantly black then appressed lateroclypeal and paraocular setae with ferruginous-golden luster (Fig. 34); flagellomeres black or partially ferruginous. Male: basal half of mandible bright ferruginous; hindtibia bright ferruginous with the remainder of the legs black; mesosomal vestiture silvery or black..............................5

5. Female: appressed lateroclypeal and paraocular setae with ferruginous-golden luster (Fig. 34). Male: cellular area of fore- and hindwing only slightly fuscous; erect setae at least on scutum partially silvery (Fig. 70); narrow placoid on flagellomere V with at most small placoid structures on neighboring flagellomeres ...................................................... S. haemorrhoidalis Fabricius, 1781

– Female: appressed lateroclypeal and paraocular setae with silvery luster (Fig. 35). Male: wings conspicuously fuscous; erect setae on thoracical dorsum black (Fig. 74); broad placoids cover entire length of flagellomeres IV–VI ...................................................................... S. victoria sp. nov.