Provisional key to Peltoperlopsis males 1 Mainland species; aedeagus symmetrical (Fig. 65) ………………………………………………...……. 2 1’ Island species; aedeagus asymmetrical (Fig. 58) ……………………………...………………………. 5 2 General color dark brown ………………………. 3 2’ General color yellow or pale brown.………….. 4 3 Tergum 10 with U-shaped sclerite; vesicle broadly arcuate, shorter than wide; aedeagus with dorsolateral pair of narrow sclerites; known from Vietnam.………………………………….. malickyi 3’ Tergum 10 apparently without U-shaped sclerite; vesicle longer than wide; known from Yunnan, China ……………………………………... nigrifulva 4 Cercal segments with enlarged dorsal bristles on mid segments (Fig. 66); vesicle broadly arcuate, shorter than wide (Fig. 64); ventroapical aedeagal lobes sparsely armed laterally with fine setal-like spines, apex bilobed (Fig. 65) …………….. spinosa 4’ Cercal segments without conspicuously enlarged dorsal bristles; vesicle about as wide as long (Fig. 69); ventroapical aedeagal lobes armed laterally with dense patch of fine setal-like spines, apex indistinctly lobed (Fig. 70) ……………….. swanni 5 Known from the Philippines …………………….. 6 5’ Known from Borneo …………………………….. 7 6 Sinistral aedeagal lobe weakly sclerotized along ventrolateral margin (Fig. 52); aedeagal lobes armed with small spines and microtrichia (Fig. 55) ………………………………………………. cebuano 6’ Sinistral aedeagal lobe membranous; aedeagal lobes armed with apical patch of cultriform spines ………………………………………….. mindanensis 7 Sinistral aedeagal lobe bifurcate apically and armed with a few large spines at dorsolateral margin (Fig. 46) …………………………... anomala 7’ Sinistral aedeagal lobe trifurcate apically and armed dorsolaterally with small spicules; known from Mt. Kinabalu ………………………… concolor

Published as part of Stark, Bill P. & Sivec, Ignac, 2007, New Species And Records Of Asian Peltoperlidae (Insecta: Plecoptera), pp. 104-126 in Illiesia 3 (12) on page 125, DOI: 10.5281/zenodo.4754627