ON VARIATION. 



43 



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

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



,*; V-'*"'* * *.'"* 



BJC 



pears there first; and finally (C. gnlaris scmifasciatus}, 

 where the color markings disappear, leaving a uniform 

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



