American butterfly for ID

[David M]

Had this one in from Colorado, US. I don't have a book on north American butterflies, but if someone reading this does possess one and would like to offer an ID I would be most grateful.

[jasonsargerson]

Hello David

It looks like Great Basin Wood Nymph - Cercyonis sthenele - to me - Butterflies Through Binoculars The West by Jeffrey Glassberg.

[David M]

That seems to be a good likeness, Jason.

Many thanks for your help.