Family Alydidae (Broad-headed Bugs)

The alydids are generally slender, elongate bugs that feed on either legumes or grasses. They are very similar in form to the grass mirids (Stenodemini), but can be easily distinguished by the presence of ocelli and numerous hemelytral veins. The common name is misleading, being derived not from an unusually wide head but from their pronotal base being not much wider. This is in contrast to the closely related family Coreidae in which the relative differences in widths are noticeably greater.

Subfamily Alydinae
(Currently empty)

Subfamily Micrelytrinae

Mutusca brevicornis

This species is also fairly widespread on the mainland and can be easily confused with species of Leptocorisa that occur there, especially the paddy bug (L. acuta). Mutusca  can be distinguished by their first antennal segment being largely swollen throughout its length. In Leptocorisa this segment is swollen only at the end.
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References

Ahmad, I. 1965. The Leptocorisinae (Heteroptera: Alydidae) of the world. Bulletin of the British Museum (Natural History) Entomology (Supplement) 5: 1-156.

Cassis, G. and Gross, G. F. 2002. Zoological Catalogue of Australian Hemiptera: Heteroptera (Pentatomomorpha). CSIRO Publishing.