148 



BULLETIN 17 5, UNITED STATES NATIONAL MUSEUM 



The sexual variation observable in this form may be summarized 

 as follows: Dorsal scale formula varies from 27-29-21 to 31-35-25 in 

 males, from 27-29-21 to 31-37-27 in females; ventrals 206 to 231 



Region 

 No. 



4 



8 



9 10 



Figure 68.— Geographic variation in number of infralabials in Pituophis catenifer caienifer. 



Region 



No. 1 2 5 4 6 6 7 8 9 10 



Figure 69.— Geographic variation in ratio of tail length to total length in Pituophis catenifer catenifer. 



(average 218.5) in males, 207 to 234 (average 222.4) in females; 

 caudals 56 to 80 (average 69.1) in males, 54 to 75 (average 63.6) in 

 females; supralabials, infralabials, preoculars, and postoculars all 

 average slightly higher in females than in males; dorsal body spots 



