maybe correct. Please note I mis-spelt the genus in my thesis - should be Coleothrix.
There are two other virtually identical species - Addyme inductalis and Calguia defiguralis, the former probably also resident in Hong Kong and the latter not yet confirmed. Species of Coleothrix have a costal tuft of scales on the ventral surface of the forewing, near the base, which is very difficult to see without catching the moth and lifting the forewing.
Full details are given in
Yanli DU, Shimei SONG & Chunsheng WU 2007. A review on Addyme-Calguia-Coleothrix genera complex (Lepidoptera: Pyralidae: Phycitinae), with one new species from China. Transactions of the American Entomological Society 133: 143-153.