Key to adult females of Manoa Fittkau

1. Frontal tubercles present; antepronotal and supraalar setae absent. Brazil............................ M. obscura Fittkau

- Frontal tubercles absent; antepronotal and supraalar setae present................................................ 2

2. Wing length 1.00– 1.16 mm; squama bare. North America................................ M. pahayokeensis Jacobsen

- Wing length> 1.50 mm; squama setose....................................................................3

3. Wing length 2.00– 2.06 mm; wing veins R with 17–20 setae, R1 with 7–8 setae, R4+5 with 23–29 setae. Tanzania........................................................................................ M. tangae Andersen & Saether

- Wing length 1.58–1.75 mm; wing veins R with 4 setae, R1 with 10–12 setae, R4+5 with 11–12 setae. Oriental China..................................................................................... M. xianjuensis Qi & Lin sp. n.