Summary[edit] Description: English: Pseudagrion decorum, Three Striped Blue Dart, is a species of damselfly in the family Coenagrionidae. It is found in many tropical Asian countries. Date: 3 July 2016, 09:46:51. Source: : This image is uploaded from observation number 1727179 at India Biodiversity Portal, a source of nature observations in India.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.. Author: Bala Chandran.