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Two unrelated bug species - as per lehelind "nymphs of Diaphyta [the larger, rounder ones] and females and nymphs of Laryngodus luteomaculatus [the narrow ones], both known to be strongly associated with Casuarinaceae"

A large cluster of these bugs found beneath discarded tin by a local and posted on the Norfolk Island Invertebrates Facebook group for assistance with ID. The male terminalia seems to be a good match for Leptocoris tagalicus as per Gross (1960; A revision of the genus Leptocoris Hahn (Heteroptera: Coreidae: Rhopalinae) from the Indo-Pacific and Australian groups). This seems to be the first record of the family/genus/species from the island. Photos 1-3 are a female, 4-6 a male, 7 is male and female, 8 is the dorsal view of the male terminalia, 9 is the ventral view, and 10 is the dorsal view without extension.

~4.5mm long (body & head)

Now, looking at the dorsal view, you wouldn't expect this to be anything other than fairly normal.

But the profile view shows a pronotal lobe with spines emminating from it.

This isn't a singular abnormallity. We found about 6 on one night, and have found them in the past.

I thought it'd make it easy to find, but my searches revealed nada!