This skipper was accidentally introduced to North America in 1910 in Ontario, Canada. They have since become well established in the east and have more recently become established in the west (Colorado, Idaho, Montana, and British Columbia). Timothy (Phleum pratense) and other grasses are the primary host plant. Because of this, their range is still expanding — perhaps due to the relocation of eggs in hay shipments.
Photo by Steve Decker on 7/19/20 in Missoula, MT.