Greater Spreadwinged Damselfly
When I read about this species on SouthwestDragonflies.net the field marks matched though the "continuous pale yellow side stripe on thorax" as described looks whiter on this damselfly and it may be immature as they note. I thought it was a male because it's top appendage matched their description and drawing.
I submitted photos to BugGuide.net and it was confirmed as as Greater Spreadwing and photos placed in that species online database. It was confirmed as a male on Arthropods Colorado facebook page. SeEtta