From BugGuide:

Identification:

Pale stripe of corium extends over cubital vein. Head and pronotum distinctly arched and head with margins emarginate before eyes. (1)
Very similar to the apparently rare C. alpina (the two will be difficult to distinguish from photos)

Range:

Widespread. Southern Canada and New England west to British Columbia, south to Florida and Texas. Also found in Central America. (1)