Key to Australian species of Ectomocoris

1. Basal two visible segments of abdomen almost similarly coloured fuscous or blackish as remainder of abdomen ventrally (e.g., Figs. 1B&C, 2A, 5B–F, 8B&C, 11, 12B–D, 19B&C, 20B&C, 21, 22B–D, 23B&C, E&F, 30B&C, 32, 33B&C)........... 2

-. Basal two visible segments of abdomen almost completely orange in contrast to fuscous or black remainder of abdomen ventrally (e.g., Figs. 4C&D, 14B&C, 16B&C, 17, 26–28).................................................... 10

2. Male abdominal sternum VII normal, without extragenital process (Figs. 8C, 30C)................................. 3

-. Male abdominal sternum VII with extragenital process on its left side (Figs. 2, 6, 11E, 12D, 20B, 21B&C, 22B&D, 24).... 5

3. Connexiva uniformly orange red (Figs. 32, 33).......................................... E. truculentus (Stål, 1863)

-. Connexiva with alternating dark and light areas (Figs. 8, 9, 30)................................................. 4

4. Male with a median carina on abdominal venter ending in a bifurcate spine-like process on posterior margin of sternum VII (Fig. 31); fore tibia with fossula spongiosa occupying about half length of tibia (Fig. 30B&C)............................................................................................... E. spinosus Malipatil & Liu, sp. nov.

-. Male without a median carina on abdominal venter ending in a bifurcate spine-like process on posterior margin of sternum VII (Fig. 8C); fore tibia with fossula spongiosa occupying over 2/3 tibial length (Figs. 8B&C, 9B)..... E. decoratus (Stål, 1863)

5. Hemelytra in macropterous form with most of corium yellow (Figs. 12A, 22A), in brachypterous form one subbasal median oblique yellow patch adjoining and behind clavus (Figs. 11A&D, 21A).......................................... 6

-. Hemelytra in macropterous form with most of corium fuscous or black (Figs. 1A, 5A, 19A, 20A, 23A, 23D), in brachypterous (not in micropterous) form with two yellow patches on corium (Fig. 5D)......................................... 7

6. Entire clavus fuscous or black in contrast to mostly yellow corium (Figs. 11A&D, 12A)..................................................................................................... E. fuscatus Malipatil & Liu, sp. nov.

-. Apical almost 3/4 of clavus yellow like most of corium (Figs. 21A, 22A)................................................................................................................. E. luteolus Malipatil & Liu, sp. nov.

7. Hemelytra with one yellow patch (Fig. 23A&D); body length 25–28 mm ................................................................................................................... E. major Malipatil & Liu, sp. nov.

-. Hemelytra with two yellow patches (Figs. 1A, 5A&D, 19A, 20A); body length <20 mm ............................. 8

8. Hemelytra with both yellow to brownish yellow patches dissimilar in size, the subbasal patch an extremely small elongate stripe on corium adjoining claval suture and, distal (second) one a large patch about halfway on inside of hemelytra on apical area of corium and base of membrane, covering most of AIC and narrow basal area of AEC (Fig. 5A&D)............................................................................................. E. borealis Malipatil & Liu, sp. nov.

-. Hemelytra with both yellow to brownish yellow patches of about similar size, distal (second) patch almost transversely positioned (Figs. 1A, 19A, 20A)......................................................................... 9

9. Hemelytra with second yellow patch on apical area of corium and basal area of membrane narrow, transverse and positioned mostly in cell AIC (Fig. 1A)....................................................... E. australicus (Reuter, 1881)

-. Hemelytra with second yellow patch broad and almost roundish and positioned in both AIC and AEC (Figs. 19A, 20A).............................................................................. E. latus Malipatil & Liu, sp. nov.

10. Only micropterous known; micropterous form with base of abdomen dorsally with a pair of large reddish orange patches fully separated by fuscous median narrow band (Fig. 4A&B).......................... E. binotatus Malipatil & Liu, sp. nov.

-. Macropterous and micropterous forms known or only macropterous form known; micropterous form with base of abdomen dorsally without a pair of orange patches as above (Figs. 17, 27, 28)............................................ 11

11. Macropterous form with hemelytra including most of clavus and all of corium similarly coloured orange or orangish brown (Fig. 16A)............................................................. E. interiorius Malipatil & Liu, sp. nov.

-. Macropterous form with hemelytra (except membrane) brownish orange except clavus and inner narrow area of corium (between PCu+1A and Cu) adjoining distal 2/3 length of clavus darker (Figs. 14A, 26A)............................ 12

12. Body large (17.2–18.3 mm); legs mostly brownish orange in contrast to black head and pronotum (Figs. 26–28)............................................................................................. E. ornatus (Stål, 1863)

-. Body small (10.6 mm); legs entirely and uniformly blackish as head and pronotum (Fig. 14)............................................................................................ E. fuscifemoralis Malipatil & Liu, sp. nov.