EXTERNAL CHARACTERS. 



691 



with the first and second toes longest and subequal ', hind feet 

 deeply emarginate, the outer toes forming long lapjjets; nails 

 of all the digits well developed, but those of the fore feet much 

 larger than those of the hind feet. Length of the adult male 

 about 8 feet, rarely 9 feet ; of the adult female, about 6| to 7 

 feet. Females smaller and lighter colored than the males. 



A specimen in the National Museum, probably an adult male, 

 from Sable Island, is silvery-gray, with spots of black and 

 white, the latter confined mainly to the sides of the body and 



