Provisional Key for Males of the Borneensis Subgroup of Neoperla

1 Notch on process of tergum 7 wider than projecting lobes …………………………...……… 2

1’ Notch on process of tergum 7 narrow, bases of projecting lobes touch on inner margins (Fig. 6).…………………………………………………….. 3

2 Posterolateral bases of hemiterga slightly widened, hemitergal finger lobes straight; everted aedeagal sac bearing a small ventrobasal conical process armed with small spines, and area between apical spine patch and dorsobasal lobes armed only with minute spinule ..……. borneensis

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2’ Posterolateral bases of hemiterga very wide, hemitergal finger lobes curved slightly outward; everted aedeagal sac without ventrobasal conical process ..………………… naviculata (2 subspecies)

3 Everted aedeagal sac tubular, without spiny lobes …………………………………………..…. furcifera

3’ Everted aedeagal sac with one or more spiny lobes ……………………………………………….. 4

4 Largest spiny lobes of aedeagal sac project laterally ………………………………...…… furcata

4’ Largest spiny lobes of aedeagal sac project ventrally or dorsally ……………………………... 5

5 Ventrobasal sac lobe conical, narrower in lateral aspect than dorsobasal spiny cushion; apical sac lobe bearing a patch of enlarged spines along mid dorsolateral margin ………………………. bilobata

5’ Ventrobasal sac lobe broadly rounded, larger than dorsobasal spiny cusion in lateral aspect; apical sac lobe without patch of enlarged spines along mid dorsolateral margin …………………………. 6

6 Everted sac surface without minute spinules scattered over surface; dorsobasal spiny cushion scarcely projecting in lateral aspect ……... harina

6’ Everted sac surface covered with minute spines; dorsobasal spiny cushion prominent (Fig. 8).……………………………………….… peterzwicki