Megathymus yuccae martini or maudae - Martin's Yucca Giant Skipper
This is the spring-flying Martin's Yucca Giant Skipper, Megathymus yuccae martini. Or, it is the spring-flying Maude's Yucca Giant Skipper, Megathymus yuccae maudae, depending on whether you accept that there is an appreciable difference. Many don't. This was in a wash north of Mid Hills, Mojave National Preserve, March 23, 2022.
Megathymus yuccae martini - Martin's Yucca Giant Skipper
This is the spring-flying Martin's Yucca Giant Skipper, Megathymus yuccae martini. Cottonwood Spring, Joshua Tree National Park, March 28, 2010.
Megathymus yuccae martini - Martin's Yucca Giant Skipper
Ventral of a different Megathymus yuccae martini, same day as above.

©Dennis Walker