88. Dorsal stripe covering only a single row of scales; lateral stripes broken 



or absent; Wash, and Oregon 



Thamnophis sirtalis concinnns (Hallowell) One-striped, Red' 

 barred Garter Snake 

 Dorsal stripe covering more than a single row of scales; lateral stripes 

 entire 89. 



89. Great Plains area 



Thamnophis sirtalis parietahs (Say) Great Plains Red-barred 

 Garter Snake 

 Pacific States 90. 



90. Color between the light stripes usually in stripes only; Wash, to Cal. 



Thamnophis sirtahs tetrataenia (Cope) Cascade Red-barred 

 Garter Snake 

 With a spotted appearance between the light stripes; Oregon, Nevada 

 and Cal. 



Thamnophis sirtahs infernahs (Blainville) California Red- 

 barred Garter Snake 



91. No loreal; prefrontal and parietal plates each touching one upper labial; 



ground color above grayish, red-mottled, with dark brown blotches; 

 belly dark-mottled; Fla. 



Stilosoma extenuaturn Brown Short-tailed Snake 

 (Stylophis extenuatus (Brown) ) 

 With one or more loreals on each side; with the prefrontals or the pa- 

 rietals or both not touching any upper labials; color various 92. 



92. Pupil of eye vertical; usually with two or three loreals on each side; back 



teeth grooved (semi-poisonous) ; with a row of dark blotches along 

 the back, each usually with a central, transverse, light area; scale count 

 21 to 24; Cal. 



Trimorphodon vandenhurghi Klauber California Lyre Snake 

 Not so; pupil of eye round; usually with one loreal on each side; back 

 teeth not grooved 93. 



93. With 15 to 17 rows of scales around the body (not counting the ventral 



plates) 94. 



With 19 or more rows of scales around the body 95. 



94. With 17 rows of scales around the body; frontal plate about as wide as 



long; color above and below almost uniformly brown or black (the 

 body may be darker posteriorly, or the scales may be dark with reddish 

 color at their bases or tips) ; chin reddish; S. C. to Fla. and Texas 

 Drymarchon corais couperi (Holbrook) Indigo Snake 

 With 15 to 17 rows of scales; frontal plate distinctly longer than wide; 

 color plain, striped or banded (Snakes normally having a divided anal 

 plate, but occasionally having a single one.) Whip Snakes and 

 Racers 208. 



95. Belly plain white or yellow; rostral plate projecting part way between 



the internasals, when viewed from above 96. 



Belly with some dark markings; rostral plate not projecting between the 



internasals, when viewed from above King Snakes 98. 



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