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

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

- Apical scutellar macrosetae absent ............................................................................................................................... 4

2. Capsules of spermatheca with constriction at the apical 1/2, or beyond apical 1/2 (Fig. 25) (Venezuela; Guyana; Suriname; French Guiana; Brazil; Paraguay) ..................................................................................... O.normus Curran

- Capsules of spermatheca without constrictions (Fig. 15) ............................................................................................. 3

3. Sternite VIII subrectangular (Fig. 16) (Guyana, Brazil) ............................................................ O. neotropicus Curran

- Sternite VIII with rounded corners (Venezuela) ..................................................................... O. nebulosus Scarbrough

4. 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