Key to males of Portelmis ( Elmidae: Elminae) species.

1 Disc of ventrite I densely granulate, without punctures (Figs 3; 5). Disc of metasternum with median longitudinal impression restricted to the posterior 1/2 (Figs. 3; 5) ...................................................................... nevermanni Group

- Disc of ventrite I densely punctate, without granules (Figs. 7; 9). Disc of metasternum with median longitudinal impression extending beyond the posterior 1/2 (Figs. 7; 9)................................................................... gurneyi Group