Key to species of the genus Phalgea

(based mainly on females since males of P. lutea and P. maculata sp. nov. are unknown)

1. Labrum hidden below clypeus (Fig 1 C); ventral margin of fore wing and one fourth of hind wing apically black (Fig 2 A).......................................................................................... P. l u te a Cameron

-. Labrum well exposed beyond apex of clypeus (Figs 1 A, 1B); wings with apical half black (Fig 2 B).................... 2

2. Two bullae of vein 2 rs-m of fore wing well separated; marginal cell of fore wing with yellowish spot; mesosoma with coarse punctures (Fig 3 A)..................................................................... P. maculata sp. nov.

-. Two bullae of fore wing vein 2 rs-m narrowly separated; marginal cell of fore wing entirely black; mesosoma with fine punctures (Fig 3 B).......................................................................... P. melaptera Wang