Fly in previous observation.
A rare find!
吹棉蚧 吹綿蚧 (Icerya purchasi) Male / About 9 mm wingspan
Reference
http://zh.wikipedia.org/wiki/介殼蟲總科
http://eol.org/pages/2646082/overview
http://digiins.tari.gov.tw/treelist003.php?id=scal13022001&lev1=3&lev2=0/19/20/&lev3=02
http://www.hkwildlife.net/Forum/viewthread.php?tid=30507&page=1