aka Arctic Skipper
Color: Upperside is black with squarish orange spots. Underside of the forewing is orange with black spots; underside of hindwing is red-orange with cream spots outlined in black.
Wingspan: 1 - 1 1/4 inches (2.5 - 3.2 cm)
Host plants: Grasses including purple reedgrass (Calamagrostis purpurascens) in California, and bromes (Bromus) in Europe; probably others.
Overwintering stage: fully-grown caterpillars
Mate-Location system: perching, sometimes patrolling
Flight: May-July
Conservation: Not usually required.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
https://www.butterfliesandmoths.org/species/Carterocephalus-palaemon