VARIATION IN GARTER SNAKES^— TH02IPS0N. 



361 



Mendocino County, California. 



Scale formulas 19-21-19-17 



19-17-15 



The color design of this set is as follows: The ground varies from 

 olive brown to olive gray; dorsal and lateral spots when present 

 small and indistinct; the median stripe distinct and yellowish or 

 merely indicated as a lighter tint than the ground color; lateral stripe 

 usually poorly defined. 



Del Norte County, California. 



Scale formulas 19-21-19-17 

 1*-17 



The colors are dull; ground dark brown; spots absent or indicated 

 by darker tones; median stripe dull orange, lateral yellowish grey. 

 This set begins to show the marked reduction in size that occurs to 

 the north; the largest, No. 29081, measures 640 mm.; tail, 161; 

 head, from tip of snout to behind angle of jaw, 22.5; snout, 7.2; 

 eye, 3.5. 



