Agrion is ambiguous in French vernacular name for certain insects. They are among the ladies, winged insect close dragonflies and grouped in the suborder Zygoptera.
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Looks like a part of a rainbow that got detached from the main body. Must be fantastic to watch in flight - buzzzzzzz and purple blends with light blue to form one line. LOL SAM & SAAB
Regards, Cornelius.