Gregarious, numerous larval cases on a Syzygium smithii hedge.

Early instar.

Cases 15-20 mm long, 10-15 mm across at widest point.

Larvae 7-8 mm long.

"...young larvae construct a larval bag from fragments of leaves during their first four larval instars before transitioning to the utilisation of sections of twigs..." (Beaver 2020).

Early instar larval case very similar to that of Hyalarcta huebneri.

Larval case was sealed, and returned to where found.

Thanks to RBGV hort staff for alerting me to this.