Common Straight Swift (Parnara guttata, 直纹稻弄蝶).
No doubt their larva are a pest for rice farmers. In late summer they emerge from the grasslands and can be found in presentable numbers in the bushes by Xiang river (湘江) as well as flower beds in parks and private spaces. I have also seen them in the flowers at the top of Yuelu Mountain (嶽麓山), but never yet at lower forested elevations. 2nd picture added 13 October 2023.
