110 



BULLETIN 01, UNITED STATES NATIONAL MUSEUM. 



this trait indicated l)y the nuiterial examined. Tlie tail lengtli is 

 strikingly constant for this group, which may be in part but not 

 entirely explained by the small amount of material; the length ex- 

 ceeds that of any other form in the genus, the extremes being .32-. .38, 

 the average between .33-.36 (see fig. 43). As is to be expected from 



174 



u- 



V 



C) 



— — > V 



Vi 



a 



166 



158 



150 



Bay St. Louis, Pensacola, Gainesville, Kissiiiunee, Lcinou Citj-, 

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



Florida. Enterprise, 

 Orlando, 

 Little Sara- 

 sota Bay, 

 Florida. 

 FiCr. 42.— Diagram showing the variation in the number of ventral scutes in Thamnophis 



.SAIIRITUS SACKENI. 



the length of the tail, the number of subcaudal scutes also exceeds 

 that of any other form. As showm by the diagram (fig. 44), the 

 extremes are 109-134 and the averages for the different localities 



,38 



.3 



i'-. 



7^^~ --2" 



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

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



Florida. Enterprise, 



Orlando, 

 Little Sara- 

 sota Bay, 

 Florida. 

 Fig. 43.— Diagram showing the variation in the proportionate tail length in Thamnophis 



sauritus sackeni. 



betw^een 120 and 127. Here again no geographic variations can be 

 detected. 



As is generally the case in the forms of the Sauritus group, there is 

 little variation in coloration in sacTccni. The usual variation of light 

 to dark in the ground color is present, the lighter individuals ])eing a 



