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PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
September 2007. The moth illustrated is from central Vietnam. Its larvae eat the leave of acacia and the damage is serious.
This is a moth in the family Notodontidae (the hindwing protruding slightly in front of the forewing is typical of genera related to the genus Stauropus). It could be placed in, or close to, the genus Syntypistis (=Quadricalcarifera), but this is by no means a certainty. A specimen with most of its scales intact would greatly assist in placing it to species.
There was also a suggestion that is might be Tiracola plagiata.
However, see http://www.ento.csiro.au/aicn/name_s/b_4066.htm for an illustration of Tiracola plagiata. This species has a steeply tectiform resting posture, with the hindwing completely hidden, unlike the original photo from Vietnam, where the hindwing protruds in front of the forewing costa, and the posture is much flatter. The species looks very close to Stauropus alternus. Both these species are resident in Hong Kong.
The global distribution of S alternus is quite large, and includes Vietnam – Holloway (1983) Moths of Borneo 3, Notodontidae and the notodontid volume of Fauna Sinica Insecta give NE Himalayas, China (Taiwan, Guangdong Province), Sundaland, Philippines, Wallacea. See photo of S alternus adult at: