VARIATIONS OF GARTER-SNAKES. 



109 



as constant, although tlie (hagrani (fig. 41) indicates tliat there is 

 some variation in the number of superior labials. Thus, while 8 

 supralabials is the rule throughout most of the range, 7 occurs in the 



iHuade*^"" 



Fig. 43.— Distribution of Th.vmnophis .s.^uritus sackeni, as indicated nv the localitv 



RECORDS. 



western (southern Mississippi and western Florida) specimens, 

 although in what proportion it is impossible to estimate, as very little 

 material is available from this region. The inferior labials are 10 in 



8 



7 



5 





11 



3 



^^ 



Bay St. Louis, Pensacola, Gainesville, Kissimmee, Lemon City, 

 Mississippi. Florida. Marion Co., Georgiana, Florida. 



Florida. Enterprise, 



Orlando, 

 Little Sara- 

 sota Bay, 

 Florida. 

 Fig. 41.— Diagram showing the variation in the number of supralabials in Thamnophis 



SAURITUS sackeni. 



every individual examined. The number of ventral plates is rather 

 variable (fig. 42). The extremes are 154-171, the average number 

 lying between 15S-166. There is no definite geographic variation in 



