As biology teachers at the Mahidol Wittayanusom School, we had in the 2003 academic year 222 students of Matthayomsuksa 4 (equivalent of grade 10), to whom we assigned the task to collect dragonfly vernacular names as used in their respective home areas. The students came from all parts of Thailand and used in their inquiries the pictures of adult and larval Crocothemis s. servilia as an example of a dragonfly. Below is the list of vernacular names, gathered from 71 (out of the 76) provinces of Thailand. (1) Malangpo (lUtS-llla) or Mangpo (tUI-JlIa) (“mang” or “malang” = small insects; po" = hemp). A generally used common name in Thailand. (2) Mang Bi (UJWU), Mang Kabi (lUWflSU), Mang Kambi (UH-JfVUJ), Sabi (H£1J), Mang Kabia (lUWfOUü), Mang Pi (im-m, UW iti) or Mang Kapi (UW-JD^W) (“hi" or “pi" or “bid' meaning the sound of odonate wing movement). Central Kamphaeng Phet, Phetchabun, Phichit, Phitsanulok, Prachuap Khiri Khan, Rayong, Samut Prakan, Samut Sakhon, Uttaradit; — Northern Chiang Mai, Chiang Rai, Lampang, Lamphun. Mae Hong Son, Nan, Phayao, Phrae; – Northeastern Chaiyaphum, Nong Khai, Roi Et, Ubon Ratchathani, Udon Thani, Yasothon; — Peninsula Chumphon, Nakhon Si Thammarat, Pattani, Phatthalung, Phuket, Ranong, Songkhla, Surat Thani, Trang, Yala.