Species diagnosis

• Third upper unicuspid markedly smaller than the fourth
• Skull length usually less than 17mm
• Strip of pigment on inside of ventromedial edge
  of i1s where they meet
• Height of coronoid process less than 4.2mm
  
• Length of coronoid-condyloid processes usually less
  than 3.6mm
  
• Depth of dentary below m1 + height of coronoid
  process less than 5.2mm

Alaska subspecies