genus Icaricia

Member of typical blues (tribe Polyommatini)
blues (subfamily Polyommatinae)
gossamer-winged butterflies (family Lycaenidae)
butterflies (superfamily Papilionoidea)
butterflies and moths (order Lepidoptera)
insects (class Insecta)
hexapods (subphylum Hexapoda)
arthropods (phylum Arthropoda)
animals (kingdom Animalia)

Except for extremely rare examples that I don't expect to encounter, there are no other wild species of this genus in the bay area.

This genus is often studied and therefore often rearranged.

acmon blue
Icaricia acmon

acmon blue
Icaricia acmon

upper wing surfaces can be pale blue (male) or orangey brown (female)
no dark discal spot on the upper side of the hind wings
orange spots on both sides of hind wings
male has paler upper wing surfaces than in lupine blue (Icaricia lupini)
common

lupine blue
Icaricia lupini

lupine blue
Icaricia lupini

upper wing surfaces can be bluish (male) or brownish (female)
dark discal spot on the upper side of the hind wings
male has darker upper wing surfaces than in acmon blue (Icaricia acmon)
orange spots on both sides of hind wings
very rare

boisduval’s blue
Icaricia icarioides

orange spots not present or barely visible
uncommon

2 observed taxons / 1 unobserved taxon / 1 key

Chris’s observations: 6 (3 are research grade)

Locations:

Almaden Quicksilver CP
Ed R. Levin CP
Sam McDonald CP
San Pedro Valley CP
Santa Teresa CP
Yosemite NP

Months:

May: 1
Jun.: 1
Jul.: 3
Aug.: 1

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Not all sites agree about the scientific name:

genus Icaricia → iNaturalist
genus Plebejus → BugGuide

Bay Area species: iNaturalist