Key to males of the Amazonian Monohelea species

1- Legs yellow, with pattern of brown patches (Figs. 3F, 4F, 5F, 7F), paramere single (Figs. 9C, 9G, 10C) or with median process (9E)................................................................................................ 2

- Legs brown, with pattern of yellowish patches (Figs. 2E, 6E, 8D), paramere with distal process (Figs. 9A, 10A, 10E, 11A, 11C, 11G)................................................................................................ 6

2- Hind femur with brown base (Figs. 4F, 7F)................................................................. 3

- Hind femur with pale or slightly infuscated base (Figs. 3F, 5F)................................................. 4

3- Paramere with mesal process (Fig. 9E)......................................................... M. ema sp. nov.

- Paramere single (Fig. 10C)............................................................ M. patauateua sp. nov.

4- Paramere single, without mesal process, with single base (Fig. 9G)............................... M. forceps sp. nov.

- Paramere with mesal process, with trilobed base (Figs. 9C, 11E)................................................ 5

5- Paramere with stout horn-shaped mesal process, base fused (Fig. 9C)............................. M. cornuta sp. nov.

- Paramere with slender mesal process, base not fused (Fig. 11E)........................... M. maculipennis (Coquillett)

6- Aedeagus with basal arms slender, not expanded antero-posteriorly (Figs. 9B, 10F, 11H), paramere with two distal processes (Figs. 9A, 10E, 11G)................................................................................... 7

- Aedeagus with basal arms large, greatly expanded antero-posteriorly (Fig. 10B, 11B, 11D), paramere with one (Figs. 11A, 11C) or two distal processes (Fig. 10A).................................................................... 9

7- Paramere with one beak-shaped distal process and other bilobed (Fig. 11G)........ M. roraimensis Felippe-Bauer & Spinelli

- Paramere distal processes not as above..................................................................... 8

8- Paramere with one hook-shaped distal process and other aculeate; paramere with ventral sclerotized structure (Fig. 10E)........................................................................................ M. visinensis sp. nov.

- Paramere with one beak-shaped distal process and other hook-shaped; paramere without ventral sclerotized structure (Fig. 9A)..................................................................................... M. barbara sp. nov.

9- Paramere with two distal hook-shaped processes (Fig. 10A).................................... M. gorayebi sp. nov.

- Paramere with one distal beak-shaped process (Figs. 11A, 11C)................................................ 10

10- Smaller species (wing length 0.87 mm); yellowish bands of femora and tibiae broad..... M. affinis Felippe-Bauer & Spinelli

- Greater species (wing length 1.13 mm); yellowish bands of femora and tibiae narrow........... M. guaimiesi Lane & Wirth