Key to the Pseudorphnus species (males)

1 Elytra without distinct striae, punctate on disc; elytral intervals almost flat....................................... 2

- Elytra with distinct striae, punctate or impunctate on disc; elytral intervals convex or flat.............................3

2 Frontoclypeus with transverse carina (Figs. 5 E–F), sculpture of frontoclypeus smooth; parameres with less acute apices (in lateral view, Fig. 5 C).................................................................... P. carinatus Frolov

- Frontoclypeus with conical tubercle medially (Figs. 6 D–E), sculpture of frontoclypeus rugose; parameres with more acute apices somewhat depressed laterally (in lateral view, Fig. 6 C)................................... P. olsoufieffi Paulian

3 Elytra with densely punctate striae (Figs. 7 A, E); elytral intervals somewhat convex; pronotal horns of male directed upward and forward (Figs. 7 A–B); apices of parameres finger shaped (Fig. 7 C); length 11–13 mm ............... P. hiboni Paulian

- Elytra almost impunctate on disc, with striae visible as slightly elevated lines (Figs. 8 A–C); elytral intervals almost flat; pronotal horns of male wider and directed upward (Figs. 8 B, D); apices of parameres hook-shaped (in lateral view (Fig. 8 G); length 6.5–8.5 mm .................................................................. P. coquerelii (Fairmaire)