雌性黑尾灰蜻 (拉丁學名 : Orthetrum glaucum Female / 英文 : Common Blue Skimmer) (Braucer, 1865) 又無黑尾，又唔係灰色，真係對資料都對死!!

參考 :
http://www.afcd.gov.hk/tc_chi/conservation/hkbiodiversity/database/popup_record.asp?id=792&lang=tc