Slate Awl (Hasora anura, 无趾弄蝶).
This rare butterfly was enjoying the Chinese wisteria in Wangling Park. It is the first time I have seen one in Hunan. From a distance I first thought it was a more common parnara guttata and only stopped to look at the Chinese carpenter bees sharing the same flowers: a good reminder that finding new things in nature is often a matter of looking closer.