2l8 



VERTEBRATE ANIMALS OF THE UNITED STATES 



T. s. infernalis (Blainville). In western Nevada and California. 



T. s. parietalis (Say). Ground color light brown; belly slate color; 

 a series of vertical red bars on each side: Missouri to the Sierra Nevadas 

 and Cascades. 



Fig. 123. — Thamnophis sirlalis {from Cope). 



T. sauritus (L.) Ribbon snake. Length 660 mm.; tail 230 mm.; 

 body very slender; stripes bright yellow: eastern States; westward to 

 Texas and Nebraska. 



Subspecies of T. sauritus 



T. s. sauritus (L.). East of the Mississippi and north of Florida. 



T. s. sackenii (Kennicott). Usually without dorsal stripe: Florida. 



T. s. proximus (Say). West of the Mississippi. 



T. radix (B . and G.) . Length 800 mm. ; tail 1 70 mm. ; stripes yellow ; 

 lateral stripes on the third and fourth rows of scales: from the Rockies 

 to western New York and south to Kansas and Missouri. 



Subspecies of T. radix 



T. r. radix (B and G.). Larger; scales 21: west of Indiana. 



T. r. butler i (Cope). Smaller; scales 19: Indiana to New York. 



T. ordinoides (B. and G.) {T. elegans B. & G.). Length 700 mm.; 

 tail 140 mm.; ground color dark brown or black; dorsal stripe bright 

 yellow; lateral stripe faint, and on second and third rows of scales, or 

 absent; back often with regular rows of large black blotches: coastal 

 region of Pacific States; eastward to New Mexico and Wyoming. 



T. Uneatus (Hallo well) . Small snakes; length 360 mm. ; tail 40 mm. ; 

 lateral stripe on scale rows 2 and 3; 19 scale rows; 5 to 6 upper labials: 

 Ohio to Iowa and Tennessee. 



T.marcianus (B. and G.). Length 510 mm.; tail 160 mm.; color light 

 yellow, with numerous square, black spots arranged like a checker 

 board ; belly white : Oklahoma and Texas to southeastern California. 



