Not Cacia. Titan data base is missing a reference to this species. The species is included in Breuning's revision of "Agniini". The elytra (only) were illustrated by Breuning, page 310. fig. 197. Type locality is Mt. Kinabalu, which isn't far from where my specimens came from.
Breuning, S. 1944. Études sur les Lamiaires (Coleoptera: Cerambycidae). Douzième tribu : Agniini Thomson. Novitates Entomologicae. Revue Mondiale d'Entomologique Systématique - Biologie. Troisième Supplément. Paris. 14(107-135):281-512. fig. 158-305.