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Thamnophis sirtalis sirtalis
Sorry, I forgot to include the reference for the quoted text http://magickcanoe.com/blog/2007/02/28/g...
The northwestern garter snake occurs in British Columbia in Canada. There are two garter snakes in Quebec: the eastern ribbon snake and the common garter snake. The ribbon snake "has dark scales right up to the back of the eye, with very pale scales on a concave area just in front of the eye." I do not see this in your specimen.