Key to males of Nelidina

1. Aedeagus with two pairs of lateral processes (Figs 26, 27).................................... N. platypenis sp. nov.

- Aedeagus with one pair of lateral processes (Figs 9, 18)....................................................... 2

2. Aedeagus with short lateral processes, not exceeding half length of shaft (Kramer 1967: fig. 22)... N. sportula Kramer, 1967

- Aedeagus with long lateral processes, exceeding half length of shaft (Figs 9, 17)................................... 3

3. Aedeagus with shaft flattened dorsoventrally, lateral processes strongly curved anterodorsally (Figs 17, 18)................................................................................................... N. coronata sp. nov.

- Aedeagus with shaft approximately tubular, lateral processes directed ventrally or curved posteriorly (Figs 8, 9; Kramer 1964: figs 80, 111).......................................................................................... 4

4. Pygofer with apex bilobed (Fig. 3); aedeagus with spine on medial portion of each lateroapical process (Fig. 9)................................................................................................... N. bifida sp. nov.

- Pygofer with apex acute, dentiform (Kramer 1964: figs 75, 110); aedeagus without spine on lateroapical processes (Kramer 1964: figs 79, 112)..................................................................................... 5

5. Aedeagus with lateroapical processes flattened, ribbon-like and twisted (Kramer 1964: figs 111, 112).................................................................................................... N. taeniola Kramer, 1964

- Aedeagus with lateroapical processes conical, not flattened nor twisted (Kramer 1964: figs 79, 80)....................................................................................................... N. defila (DeLong, 1953)