Callophrys nelsoni nelsoni
Nelsoni is closely related to juniper-feeding hairstreaks whose populations may overlap its own. Though there may be intergradation in these places, nelsoni is associated not with junipers but with Incense Cedar, and it has a single brood, from May into July. It is less boldly patterned underneath as well, with the white line typical of its congeners reduced or nearly absent.
Callophrys nelsoni nelsoni, at flowers in Icehouse Canyon not far from Mt. Baldy in the San Gabriels. May 24, 2017.
Another from Icehouse Canyon but eight years earlier: June 18, 2009. The Yerba Santa there can be a great butterfly spot when it's in bloom.
Typical Nelson's Hairstreak along the Forsee Creek Trail off Jenk's Lake Rd, south of Big Bear. June 4, 2006.
Nelson's Hairstreak on the Mt Waterman Trail in the San Gabriels. June 25, 2006.