Key to Indonesian species of Hyboella

1(6) Tegmina and hind wings absent.

2(3) In dorsal view, the apex of posterior process of the pronotum broad and excised......................... H. overbecki

3(2) Apex of posterior process of the pronotum narrow and rounded.

4(5) Smaller, length of male body 6.5 mm, pronotum 5.5-5.9 mm, hind femur 3.5-4 mm. Female unknown.......... H. keyensis

5(4) Larger, length of female body 8 mm, pronotum 7.8 mm, hind femur 6.2 mm. Male unknown.................. H. similis

6(1) Tegmina and abbreviated hind wings present.

7(10) Posterior angles of the lateral lobes of the pronotum oblique truncate or broadly rounded (Figs. 2, 6).

8(9) In lateral view, the median keel of pronotum before shoulders high...................................... H. dilatata

9(8) Median keel of pronotum before shoulders moderately low (Figs. 1, 5)................................ H. perakensis

10(7) Posterior angles of the lateral lobes of the pronotum pointed (Figs. 10, 14)..................... H. sumatrensis sp. nov.