Much of North America except Alaska, Yukon, Nunavut, and Newfoundland. However, as of 2009, all
Hemaris diffinis (Hodges # 7855) at BugGuide from west of the Continental Divide should be moved to this newly elevated species. In some places just east of the Divide (Colorado, Alberta) overlap of ranges is known and specific identity becomes problematical when based on photographs.
(2)