Species diagnosis

• Third upper unicuspid equal to or slightly larger than the fourth
• Fifth upper unicuspid not readily apparent
• Length of dentary usually less than 6.5mm
  
• Length of c1-m3 less than 4.1mm
  
• Height of coronoid process less than 3.2mm
• Pigment on i1 distributed in two sections
  
• i1 set at an angle more than 8 degrees from the
  horizontal ramus of the dentary
• Limited to Pribilof Islands
  
• Pelage tricolored

• Alaska subspecies