Hello,
Finally, this damselfly is from the genum Enallagma...
By comparing my picture with the picture and the text on the following web site of Quebec's damselflies, I'm pretty sure it is E. cyathigerum.
http://odonatacentral.bfl.utexas.edu/fieldguide/species.asp?taxaid=688
Here are other pictures of other Enallagma species from Quebec. 2 of them looks very similar to E. cyathigerum but I found some minor differences with mine (color of legs, colors of segments, etc...)
http://odonatacentral.bfl.utexas.edu/checklists/namerica/canada_checkList.asp?State=Quebec
The 2 other looking similar are E. boreale and E. civile.
What do you think about what I found?
Thank you again!
Michel