o(U 



DR. H. GADOW OX EVOLUTION 



[Mar. 20, 



nor are sucli new spots developed in the stripes. Pale brown field- 

 spots are invariably present in youth and middle age. The collar 

 is the strongest and most complete in the whole genus, without 

 granules, except here and there a' granule inserted between 

 neighbouring scales of the edge. 





^Z 



^ 77 





- J> s 



S h^ o o a 



^.i S ? S 

 II II II II 



The evolution of the dorsal pattern is somewhat complicated in 

 detail, owing to the considerable amount of individual variation 



