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Argia vivida
GustavoMorejon, efectivamente muy parecidos y creo que tienes razón no es del grupo de las Enallagma es Argia vivida.
Great pic ! Take a look at this one, very similar, from Ecuador : http://www.projectnoah.org/spottings/222... (I am still unable to identify it).
but this is in Mexico so maybe Northern Bluet Enallagma annexum http://fwp.mt.gov/mtoutdoors/HTML/articl...