Key to species of Pachyrrhiza

1. Hind femur with 3–5 anteroventral macrosetae distributed along entire length (Fig. 26); male abdomen with or without silver velutum pubescence................................................................................... 2.

- Hind femur with 1 or 2 subapical anteroventral macrosetae (Fig. 9); male abdomen with silver velutum pubescence (Fig. 18).................................................................................................... 4.

2. Male abdomen with silver velutum pubescence; wing mottled, but radial cells not distinctly fenestrate; midcoxa with pale setal pile on posterior surface (Figs 13–17).................................................... P. elegantissima sp. n.

- Male abdomen without silver velutum pubescence; wing infuscation extensive with some radial cells distinctly fenestrate; midcoxa without setae on posterior surface (Figs 22, 24, 26, 28)................................................ 3.

3. Abdomen entirely dark brown (Figs 22–25)............................................... P. pictipennis Philippi.

- Abdomen dark brown with all tergites and terminalia yellow laterally (Figs 26–29)............... P. subpictipennis sp. n.

4. Posterior surface of midcoxa and hind coxa with patch of pale setae (Figs 18–21)................. P. parargentata sp. n.

- Posterior surface of midcoxa and hind coxa lacking setae (mid coxa rarely with a single seta)......................... 5.

5. Wing mostly hyaline; patch of black parafacial setae small in male, absent in female (Figs 9–12)..... P. argentatoides sp. n.

- Wing markings distinct, especially along anterior portion; lower part of parafacial with patch of black setae adjacent to white genal setae (Figs 5–8).................................................................. P. argentata Oldroyd.