Key to species of Desertaclopus

1. Distance between clypeal and frontal carinae (at middle) more than twice as the distance between clypeal apical margin and clypeal carina; size 5.0–9.0 mm......................................................................... 2

1’. Distance between clypeal and frontal carinae (at middle) as long as or smaller than the distance between clypeal apical margin and clypeal carina; size> 11.0 mm; males with parameres as in Figs. 40 a–b............. Desertaclopus lucasi new species .

2. Males with parameres as in Fig. 41 a; Argentina ........................................... D. marcosi new species .

2’. Males with parameres as in Fig. 42; Chile ............................................ D. atacamensis new species .