Key to normus species group males, modified from Scarbrough (2008)

1. Apical scutellar macrosetae present.............................................................................................................................. 2

- Apical scutellar macrosetae absent ............................................................................................................................... 7

2. Apex of epandrium narrow (Figs. 10, 11); hypandrium with long macrosetae medially (Figs. 8, 11) ........................ 3

- Apex of epandrium wide (Figs. 2, 3, 20, 24, 42, 43); hypandrium without long macrosetae medially or with setae (Figs. 1, 3, 19, 24, 41, 43) ............................................................................................................................................. 4

3. Hind femur of male with 0–2 apical anteroventral macrosetae; apex of gonostylus not forked (Fig. 12); subepandrial sclerite projection long and with inner margin triangular basally (Fig. 13) (Guyana, Brazil) ... O. neotropicus Curran

- Hind femur of male with 3–4 stout brown anteroventral macrosetae apically, 2–3 much longer, thinner and yellow macrosetae basally, 1–2 preapical posteroventral macrosetae; apex of gonostylus forked; subepandrial sclerite sim- ple, without projection (Venezuela) ....................................................................................... O. nebulosus Scarbrough

4. Apex of epandrium truncate; gonocoxite with short apical spine; hypandrium with 2–3 long setae (Venezuela)......... ....................................................................................................................................................... O. tepui Scarbrough

- Apex of epandrium not truncate (Figs. 2, 3, 20, 24, 42, 43); gonocoxite without spine (Figs. 1, 3, 19, 24, 41, 43); hypandrium without long setae (Figs. 1, 3, 19, 24, 41, 43) .......................................................................................... 5

5. Apex of epandrium bifid or with three teeth (Figs. 3, 43) ............................................................................................ 6

- Apex of epandrium simple (Fig. 24) (Venezuela; Guyana; Suriname; French Guiana; Brazil; Paraguay).................... ............................................................................................................................................................ O.normus Curran

6. Epandrium with bifid apex (Fig. 3); subapex of gonostylus narrow (Fig. 5); ejaculatory apodeme with basal 2/3 moderately wide and apical 1/3 narrow in lateral view (Fig. 6) (Brazil) .......................................... O. castroi sp. nov.

- Apex of epandrium with three teeth (Fig. 43); subapex of gonostylus wide (Fig. 46); ejaculatory apodeme with basal 1/3 moderately wide and apical 2/3 narrow in lateral view (Fig. 45) (Brazil) .................................. O. trifidus sp. nov.

7. Dorsocentral macrosetae usually black, rarely 1–2 yellow; cell r2 wide apically, apex rounded (Brazil; Paraguay).... .......................................................................................................................................................... O. pulcher (Engel)

- Dorsocentral macrosetae yellow; cell r2 narrow apically, apex pointed (Brazil) .......................... O.ruficaudus Curran