Shot this skipper in the west. At first I thought it is a Small Branded Swift, but checking the BC checklist shows a possibility of it being the Borbo cinnara (Formosan Swift). Wound appreciate greatly a comment from experts regarding the ID of this skipper.
Horace
For your further considerations,
From HKLS: Seems to have more white spots on hindwing/underside.
From Taiwanese book: 4 white spots on hindwing (mirrored on both upperside & underside).
(pp 259, ISBN-957-455-149-0)