Key to species of Pseudorhyncomyia

1. Wing cell r4+5 petiolate (Fig. 8). Vein M with a very shallow curve (Fig. 2). Parafacial and anterior half of genal dilation bright waxy yellow without piliferous dots (Figs. 3–4). Black spot in lower part of parafacial much smaller than black spot on gena (Fig. 1). Facial membrane without tomentum (Fig. 3). Lower facial margin projecting forward slightly beyond a vertical line through antennal pedicel in profile view; without microtomentum on anterodorsal surface (Fig. 3). Yellow area dorsally on each side of base of abdomen affecting T1+2 and T3 (Fig. 2). White setae usually rather thick and short, sometimes yellowish distally (Figs. 1, 2, 4, 12)................................................. Pseudorhyncomyia aethiopica sp. nov.

– Wing cell r4+5 open (Fig. 15). Vein M angulate (Fig. 15). Parafacial and anterior half of genal dilation with white microtomentum over yellow ground colour and with distinct piliferous dots (Figs. 17–20). Black spot in lower half of parafacial larger than black spot in anterior half of gena (Figs. 17–20). Facial membrane with greyish-white tomentum (Figs. 17, 18). Lower facial margin projecting forward far beyond a vertical line through antennal pedicel in profile view, with a triangular area of white microtrichosity on anterodorsal surface (Fig. 22). Yellow area dorsally on each side of base of abdomen affecting T1+2 only (Fig. 15). White setae thin and slender, not yellowish distally................... Pseudorhyncomyia braunsi (Villeneuve)