88 



HERPETOLOGY OF MICHIGAN. 



Dorsal scale rows iisiialh^ 25-23-21-19, keeled and with two pits; 

 snpralabials usually 8; infralabials 9, 10, or 11; veutrals 120-137; 

 subeaudals 33-48; anal divided. 



The ground color of the back varies from gray or yellow to red, 



\\ ccrr.\t-uot^ OF Canada 



\- "V 



I L L I N IS 



Ay c^/vyf^A 



ERIE 



Fig. 31. Distribution of Heterodon platyrhinus. 

 Horizontal ruling, specimens examined ; vertical ruling, reports only. 



reddish brown or black. When the color is light there are three 

 series of spots — a vertebral row of large spots alternating with a 

 lateral row of smaller ones on either side. Tail cross-banded above. 

 A dark band across the head on the suture between the prefrontals 

 and occipitals and frontal; and another from the orbit to the angle 

 of the mouth. An elongated dark blotch on either side of the neck. 



