Key to the world species of Vittacus Keifer
1 Dorsal tubercles ahead of rear shield margin ................................................................ 2
Dorsal tubercles on rear shield margin.......................................................................... 3
2 Coxal area smooth, empodium 4rayed, solenidion knobbed, prodorsal shield design obscure, median, admedian and submedian lines absent ................................................ ............................................................................ Vittacus plucheae AbouAwad & Nasr
Coxal area with short lines, empodium 5rayed, solenidion unknobbed, median, adme dian and submedian lines on prodorsal shield present .................................................... ................................................................................. Vittacus fissistigmae Wei & Kuang
3 Coxal area smooth, prodorsal shield with median, admedian and submedian lines ....... ...................................................... Vittacus bougainvilleae AbouAwad & ElBanhawy
Coxal area with granules, prodorsal shield design obscure or smooth ......................... 4
4 Empodium 4rayed, setae h1 absent .......................................... Vittacus mansoni Keifer
Empodium 3rayed, setae h1 present ..................................... Vittacus humuli sp. nov.