Callophrys loki thornei
Callophrys loki thornei is known only from the Otay Mountains Wilderness near the Mexican border, where it flies among stands of its host Tecate Cypress (Cupressus forbesii) - a rare butterfly dependent on an uncommon tree.
Thornei has two broods, the first with adults flying late February through March, and the next in June/July. The early brood emerges from over-wintered pupae. Females oviposit on new growth on mature trees, and larvae emerge a week or two later and bore into young stems during the first instar (later instars feed on the outside of the plant). After 26-35 days developing as larvae, they pupate for 10-15 days in the ground litter at the base of the host. This summer brood then emerges to mate and their offspring overwinter as pupae, and the cycle begins anew. [Source] According to Michael Klein, a biologist who knows this species exceptionally well, wet season forms may have green underneath; dry season forms are more brownish/purple.