Key to species of Margattea from China
1 Tegmina barely reaching middle of abdomen (Figs. 12, 13).......................................... M. hemiptera
- Tegmina reaching or extending beyond the end of abdomen (Figs. 1–11)......................................... 2
2 Hind wings obviously reduced, not reaching the end of abdomen.................................. M. perspicillaris
- Hind wings fully developed, reaching or extending beyond end of abdomen (Figs. 1–11)............................ 3
3 Pronotum without maculae.................................................................. M. immaculata
- Pronotum with maculae (Figs. 1, 3, 5, 7, 9, 11, 16, 25, 34, 45, 56).............................................. 4
4 Interocular space relatively narrow, nearly equal to half of distance between antennal sockets (Figs. 4, 23).. M. angusta sp. n.
- Interocular space wide, evidently wider than half of distance between antennal sockets (Figs. 2, 6, 8, 10, 14, 32, 43, 54)... 5
5 The front femur Type B3, distal part with 3 large spines (Fig. 37)............................................... 6
- The front femur Type B2, distal part with 2 large spines (Figs. 19, 48, 59)....................................... 10
6 Supra-anal plate with hind margin concave in the middle............................................ M. trispinosa
- Supra-anal plate with hind margin round and curved (Fig. 39)................................................. 7
7 Interstylar margin strongly produced (Fig. 40).............................................................. 8
- Interstylar margin not produced and nearly truncate........................................................... 9
8 Interstylar region semicircular, hind margin armed with small spines.................................... M. spinifera
- Interstylar region elliptical, lateral margin armed with small spines (Fig. 40)........................... M. flexa sp. n.
9 Median phallomere with brush-shaped structure at apex............................................... M. furcata
- Median phallomere with spine-shaped structure at apex........................................... M. mckittrickae
10 Male eighth tergum unspecialized............................................................... M. producta
- Male eighth tergum specialized and with a group of setae in the middle of hind margin (Figs. 20, 49, 60).............. 11
11 Supra-anal plate with hind margin broadly incised in the middle (Fig. 61)........................................ 12
- Supra-anal plate with hind margin curved and not incised (Figs. 21, 50)......................................... 15
12 Subgenital plate obviously asymmetrical (Fig. 62)......................................................... 13
- Subgenital plate symmetrical or almost symmetrical....................................................... 14
13 Styli long and slender, distinctly longer than interstylar space.......................................... M. limbata
- Styli short and robust, approximately equal to interstylar space (Fig. 62)....................... M. pseudolimbata sp. n.
14 Median phallomere with a pair of spinelike sclerites................................................. M. nimbata
- Median phallomere without a pair of spinelike sclerites.............................................. M. punctulata
15 Median phallomere with brush-shaped sclerites at apex, or accessory structure with brush-shaped sclerite (Fig. 22)....... 16
- Median phallomere without brush-shaped sclerites at apex, and accessory structure without brush-shaped sclerite (Fig. 51)...................................................................................................... 17
16 The accessory structure of median phallomere with brush-shaped sclerite................................ M. speciosa
- The accessory structure of median phallomere without brush-shaped sclerite (Fig. 22)..................... M. bisignata
17 Interstylar margin concavely arched............................................................. M. concava
- Interstylar margin not concave (Fig. 51)................................................................. 18
18 Median phallomere forked at apex........................................................... M. multipunctata
- Median phallomere unforked at apex (Fig. 51).................................................. M. spinosa sp. n.