Just for your information: the hindwing markings are same as the male specimen, Suastus minutus aditia Evans, figured in "The Butterflies of Thailand based on Yunosuke Kimura collection volume 1: Hesperiidae, Papilionidae and Pieridae" edited by Y. Kimura, T. Aoki, S. Yamaguchi, Y. Uemura & T. Saito, page 71, 2011. The authors described it is smaller than S. gremius and the white mark in space 2 on upperside forewing is formed with verticle or circle shape. (Note: The subapical markings on the underside of forewing from your photo are not matching the figured specimen).
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