Key to the species of Peripus Chatzimanolis and Hightower

1. Pronotum punctation dense, punctures contiguous to almost contiguous (Fig. 6), antennomeres 8–10 clearly longer than wide; aedeagus as Figs. 24–26........................................................................ P . didontus

- Pronotum punctation not as dense (Figs. 5, 7–8), punctures not contiguous; antennomeres 8–10 subquadrate to slightly longer than wide........................................................................................... 2

2. Median lobe with two subapical teeth; paramere pointed apically (Fig. 29)............................. P. madrededios

- Median lobe with one subapical tooth; paramere rounded apically (Figs. 23, 32)................................... 3

3 Paramere converging to apex (Fig. 23); paramere shorter than median lobe (Figs. 21–22); pronotum punctation with 1–2 rows of scattered punctures (besides punctures on the midline; Fig. 5)......................................... P. brunkei

- Paramere slightly expanding to apex (Fig. 32); paramere slightly longer than median lobe (Figs. 30–31); pronotum punctation with 2–3 rows of scattered punctures (besides punctures on the midline; Fig. 8)......................... P. monodontus