VARIATIONS OF GAETER-SNAKES. 



95 



labials occur in practically one-half of the specimens, and, while the 

 infralabials are occasionally 8, 9, or 10, the average is very close to 

 8. The single specimen from Columbus has 6/8, the one from Frank- 



8 



7 



>c^ 30 



(> 



4i 



\2 



;c 



\ 



\ 



\ 



^^ 



Indiana. Michigan. Oliio. Pennsylvania. 



Fig. 32.— Diagram showing the variation in the number of supralabials in Thamnophis 



BUTLERI. 



10 



8 



7 



Indiana. Michigan. Ohio. Pennsylvania. 



Fig. 33.— Diagram showing the variation in the number of infralabials in Thamnophis 



BUTLERI. 



lin, Venango County, Pennsylvania has 6/8, and Mr. Fowler's speci- 

 men from McKean County, Pennsylvania, 6/6-7. 



An examination of the ventrals shows the following distribution: 

 Ann Arbor, males 134-146, females 132-140. All of the Indiana 



