title: Satyrium fuliginosum
text: # Satyrium fuliginosum
  
  Satyrium fuliginosum, the sooty hairstreak, is a butterfly of the family Lycaenidae. It is found in western North America from British Columbia to central California, east to Wyoming and northern Colorado.
  
  Adults are on wing from July to August. Adults feed on flower nectar.
  
  The larvae feed on Lupinus.
  
  ## Subspecies
  
  * S. f. albolineatum Mattoon & Austin, 1998
  * S. f. fuliginosum
  * S. f. tildenia Mattoon & Austin, 1998
  