Redspot 
Regal Hairstreak 
Reverdin's Blue 
Rocky Mountain dotted blue 
Romanoffs hairstreak 
Round-banded Brownie 
Saltbush Blue 
Saltbush blue 
Sand Mountain blue 
Satyrium caryaevorus 
Scarce copper 
Scarce large blue 
Separated Stripestreak 
Short-tailed blue 
Silver royal 
Silver-banded hairstreak 
Silver-studded Blue 
Silverstreak Blue 
Silvery Blue 
Sky-blue Hairstreak 
Slate Flash 
Sloe hairstreak 
Small blue 
Small copper