For the the first time ever in Thailand, we have recorded Chlorocryptus purpuratus (Smith, 1852)! A cryptine Darwin wasp with large body size and metallic blue, purple, or green gloss. It is broadly distributed in Southeast Asia up to the North of China and is well known as a common parasitoid of cup moths (Lepidoptera, Limacodidae), which sometimes are harmful for leaves of various trees in the tea family (Theaceae). Even if specimens from Southeast Asia are not rare in the museum collections we have actua