706 13. COLUBRID 
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; urosteges fewer (51 to 80), average in males 70, 
females 63), scale rows usually (70 to 75%) 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. 
