Identifying some butterflies can be difficult, particularly blues, fritillaries, checkerspots and crescents. I'm reasonably sure that most, if not all, are correct.
Becker's White - Pontia beckerii
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Acmon Blue - Icaricia acmon
Arrowhead Blue - Glaucopsyche piasus
Boisduval's Blue - Icaricia icarioides
Boisduval's Blue - Icaricia icarioides
Boisduval's Blue - Icaricia icarioides
Boisduval's Blue - Icaricia icarioides
Boisduval's Blue - Icaricia icarioides
Silvery blue butterfly - Glaucopsyche lygdamus
Silvery blue butterfly - Glaucopsyche lygdamus
Square-spotted Blue - Euphilotes battoides
Square-spotted Blue - Euphilotes battoides
Cabbage White - Pieris rapae (introduced)
Cabbage White - Pieris rapae (introduced)
Cabbage White - Pieris rapae (introduced)
Cabbage White - Pieris rapae (introduced)
Anicia Checkerspot - Euphydryas anicia
Anicia Checkerspot - Euphydryas anicia
Edith's Checkerspot - Euphydryas editha
Edith's Checkerspot - Euphydryas editha
Edith's Checkerspot - Euphydryas editha
Edith's Checkerspot - Euphydryas editha
Northern Checkerspot - Chlosyne palla
Northern Checkerspot - Chlosyne palla
Northern Checkerspot - Chlosyne palla
Northern Checkerspot - Chlosyne palla
Sagebrush Checkerspot - Chlosyne acastus
Clouded sulphur - Colias philodice
Clouded sulphur - Colias philodice
Common Ringlet - Coenonympha california
Common Ringlet - Coenonympha california
Mylitta Crescent - Phyciodes mylitta (probably)
Mylitta Crescent Phyciodes mylitta - (probably)
Small Wood Nymph - Cercyonis oetus
Small Wood Nymph - Cercyonis oetus
Desert Marble – Euchloe lotta
Desert Marble – Euchloe lotta
Desert Marble – Euchloe lotta
Desert Marble – Euchloe lotta
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
Coronis Fritillary - Argynnis coronis (probably)
gray hairstreak - Strymon melinus
gray hairstreak - Strymon melinus
Lorquin's admiral - Limenitis lorquini
Monarch - Danaus plexippus
Mormon Metalmark - Apodemia mormo
Mourning cloak - Nymphalis antiopa
Purplish Copper - Lycaena helloides
Purplish Copper - Lycaena helloides
Red Admiral - Vanessa atalanta
Sara Orangetip - Anthocharis sara - male
Sara Orangetip - Anthocharis sara - female
Satyr Anglewing - Polygonia satyrus
Satyr Anglewing - Polygonia satyrus
Satyr Anglewing - Polygonia satyrus
Satyr Anglewing - Polygonia satyrus
Anise Swallowtail - Papilio zelicaon
Pale Swallowtail - Papilio eurymedon
Western Tiger Swallowtail - Pterourus rutulus
Western Tiger Swallowtail - Pterourus rutulusl on Fuller’s teasel