706 13. COLUBRIDJE 



Synopsis of Species and Subspecies 

 a. — Coloration on anterior half of body not largely red. 

 b. — The number of gastrosteges less the number of dorsal 

 blotches on body and tail rarely exceeds 151. 

 c. — Gastrosteges fewer (200 to 230), average fewer than 

 225 j urosteges fewer (51 to 80), average in males 70, 

 females 63), scale rows usually (70 to 75 7o) not more 

 than 31. 

 d. — Dorsal blotches more numerous on body {56 to 

 93, average 70) and tail (14 to 30, average 21.4). 

 P. c. catenifer. — p. 707. 

 d'. — Dorsal blotches fewer on body (48 to 70, average 

 57.6) and tail (13 to 19, average 15). 



P. c. heermanni. — p. 715. 

 c. — Gastrosteges more numerous (217 to 243), average 

 more than 225} urosteges more numerous (62 to 85, 

 average in males 76, females 70); scale-rows usually 

 (63%) more than 31. Dorsal blotches numerous 

 on body (54 to 89, average 74) and tail (14 to 29, 

 average 22.8). 



P. c. annectens. — p. 719. 

 b'. — The number of gastrosteges less the number of dorsal 

 blotches on body and tail usually exceeds 151; 

 gastrosteges more than 220. 

 cc. — The sum of the number of scale-rows and of pre- 

 oculars on both sides of head rarely exceeds 33; 

 usually one preocular. 



P. c. stejnegeri.— p.729. 



cc'. — The sum of the number of scale-rows and of pre- 



oculars on both sides of head usually exceeds 33. 



dd. — The sum of the number of caudal blotches and 



preoculars of both sides of head usually exceeds 



16; usually two preoculars; posterior dorsal 



blotches not distinctly reddish. 



P. c. deserticola. — p. 725. 



