ON' VARIATION. 



43 



first at the posterior part of the dorsal region (i. e., the 

 sacral and lumbar). The confluence of the spots ap- 



. (4r'iiir< 



» • ■ f 



I \ 



( i 





pears there first; and finally (C gularis semifasciatus), 

 where the color markings disappear, leaving a uniform 

 hue, this also appears first at the posterior part of the 



