This is Apodemia virgulti davenporti, a spring flying, single-brooded member of the mormo-complex. From Piute Mountain Road off Kelso Valley Road, April 20, 2014.
Ventral of Apodemia virgulti davenporti, same day and place. This butterfly was named after Ken Davenport of Bakersfield, a generous and extremely knowledgable collector of the Kern and Tulare County region and beyond.
I saw many on this day, 2.6 miles along Piute Mountain Road off Kelso Valley Rd., a great spot full of the host, Eriogonum fasciculatum. Thanks to David Horner and to Mr. Davenport for the exact location.
One more from a beautiful day. A key difference between this particular metalmark and nominate virgulti is that the former has but one brood, while the latter has two or three during the year.