Key to females of Apocephalus mucronatus group species

1 Tergite 6 with row of long posterior setae (Fig. 22)............................. Apocephalus setissitergus new species

- Tergite 6 lacking row of such long posterior setae (Figs. 17–21, 23).............................................. 2

2 Tergites plain brown, with small setae dorsally on tergite 6 (Figs. 19, 21); North America ............................. 3

- Tergites yellowish, with darker markings and usually larger setae on segment 6 (Figs. 17, 18, 20, 23); Central and South Amer- ica................................................................................................. 4

3 Ventral sclerite of oviscape small, nearly round (Fig. 13); sternite 6 laterally without setulae................................................................................................. Apocephalus missouriensis new species

- Ventral sclerite more elongate; sternite 6 laterally with setulae................ Apocephalus mesacanthus Brown & LeBrun

4 Dorsomedian process of oviscape extremely long, extending to near apex of oviscape (Figs. 4, 7)....................... 5

- Dorsomedian process of oviscape shorter, ending well anterior to apex of oviscape (Figs. 3, 9)......................... 6

5 Oviscape shorter, broad; portion of oviscape anterior to ventral sclerite markedly and abruptly narrower than rest of oviscape and less than one-half total oviscape length (Fig. 14); median sclerite of venter of oviscape more round in shape................................................................................... Apocephalus mucronatus Borgmeier

- Oviscape elongate, narrower portion of oviscape anterior to ventral sclerite gradually tapered, closer to one-half total oviscape length (Fig. 11); median sclerite of venter of oviscape more elongate............... Apocephalus longimucrus new species

6 Sternite 6 with longer setae anterolaterally (Fig. 24).............................. Apocephalus longimanus new species

- Sternite 6 lacking longer setae anterolaterally (Fig. 29)............................... Apocephalus weissi new species