Facts about Black Flies

• Small humpbacked flies that develop in clear running water
  
• The adults live for about 2-3 weeks
  
• Females feed on blood, males on nectar
  
• Black flies bite in the middle of the day
  
• As the female bites, she injects saliva into the skin, which is highly irritating and leads to swelling and itching
  
• Females deposit from 150 to 500 eggs in submerged vegatation. The eggs hatch in four to five days.