16 ARKIV FÖR ZOOLOGI. BAND 2. N:0 20. 



to this species, to which however the peculiarly lengthened 

 finger evidently assigns it, if we do not want to establish 

 two species, recognized by this character, specifically distinct 

 only by the colour and the different appearance of the skin. 

 Tn length of extremities and other external characters there 

 are no differences to be detected. 



Of the third species, A. calcaratus Peters, there is one 

 single small example, which very well agrees with descrip- 

 tions previously given. The light belly is provided with a 

 few well marked round dark-brown spöts. 



The average table below shows t ha t the forms examined, 

 apart from what has al ready been said, stånd very near to 

 each other. A comparison between old and young specimens 

 of A. variahilis does not exhibit either any remarkable diffe- 

 rences due to ages. The thighs, however, seem to increase 

 in length with age, while, on the contrary, other parts of 

 limbs perhaps decrease somewhat. Moreover, the head appears 

 to be broader and the eye smaller with increasing age. 



