New information is presented on the ecology and phenology of the zygaenid moth Pollanisus cyanotus (Meyrick, 1886). The known distribution of the species is extended to a site in the Baranduda ranges of northeastern Victoria. The previously unknown larva is described, with Hibbertia obtusifolia DC (Dilleniaceae) and Hibbertia riparia (R.Br. ex DC.) Hoogland (Dilleniaceae) recorded as larval food plants. A dipteran parasitoid is also noted. Observations are made in relation to adult behaviour and morphology.