too §=Fretp Museum or Naturat History — Zootocy, Vou. X. 
Measurements. Type: Total length 201; head and body 116; 
tail 85; hind foot 24. Skull: Zygomatic breadth 13.8; breadth of 
braincase 13; interorbital breadth 5.5; nasals 10.6 x 3.4; aoe foram- 
ina 5.7; diastema 7; upper molar series 4.6. : 
Remarks. This form is readily distinguished by its wholly black 
tail and feet, the other forms of A. mollis having grayish feet and a 
bicolored tail. These characters are seen in their incipiency in speci- 
mens from localities immediately west of Poco Tambo and evidence of 
the gradation from one form to the other is practically complete. At 
Poco Tambo the conditions are those of typical montagna with dense 
humid forests, but relatively cool climate. 
