Key to Chinese species of Frisilia based on genitalia
1 Male ............................................................................................... 2
- Female............................................................................................. 8
2 Cucullus with a process at ventrobasal corner.............................................................. 3
- Cucullus without a process at ventrobasal corner............................................................ 5
3 Ventrobasal process of cucullus longer than its basal width (Fig. 20).............................. F. trisigna sp. nov.
- Ventrobasal process of cucullus shorter than its basal width................................................... 4
4 Juxta with a vertical ridge along midline from posterior margin to anterior margin (Fig. 18)................... F. sulcata
- Juxta without a ridge (Fig. 19)......................................................... F. motuoensis sp. nov.
5 Juxta with a large flap (Park 2008: 22, fig. 51)..................................................... F. cornualis
- Juxta without a flap................................................................................... 6
6 Cucullus narrowed from base toward apex (Park 2008: 21, fig. 49)..................................... F. chinensis
- Cucullus widened medially............................................................................. 7
7 Cornuti of aedeagus with teeth (Gozmány 1978: Pl. 35, fig. 73)...................................... F. homalistis
- Cornuti of aedeagus without tooth (Fig. 17)............................................... F. basistricta sp. nov.
8 Corpus bursae with three signa (Fig. 23)..................................................... F. trisigna sp. nov.
- Corpus bursae with a single signum...................................................................... 9
9 Ductus bursae sclerotized (Park 2008: 24, fig. 63).................................................. F. cornualis
- Ductus bursae membranous............................................................................ 10
10 Ductus bursae without spines (Gozmány 1978: Pl. 68, fig. 73)....................................... F. homalistis
- Ductus bursae with spines............................................................................. 11
11 Ductus seminalis without spinules on inner wall........................................................... 12
- Ductus seminalis with spinules on inner wall.............................................................. 13
12 Ductus seminalis arising from ductus bursae posteriorly, signum with dense denticles and a large tooth (Gozmány 1978: Pl. 68, fig. 74).................................................................................... F. chinensis
- Ductus seminalis arising from ductus bursae anteriorly, signum with dense denticles but without tooth (Wu 1997: Pl. XXXIII, fig. 8)................................................................................... F. homochlora
13 Signum placed posteriorly, ductus bursae with a plate bearing four spines (Fig. 22)................ F. motuoensis sp. nov.
- Signum placed anteriorly, ductus bursae without a plate (Fig. 21).............................. F. basistricta sp. nov.