40. THAMNOPHIS 789 



eee. — Dorsal line present over most of body, 

 ff. — Dorsal line very distinct with sharply defined 

 borders not invaded by dorsal spots, little dark 

 pigmentation on gastrosteges. 



T. ordinoides elegans. — p. 824. 

 ii\ — Dorsal line with borders invaded by dorsal 

 spots, dark pigmentation of gastrosteges often 

 present. 

 g. — Preocular single, dorsal spots and dark pig- 

 mentation of gastrosteges usually very promi- 

 nent. 



T. ordinoides vagrans. — p. 829. 

 g". — Usually two preoculars, dorsal spots and pig- 

 mentation of gastrosteges usually less evi- 

 dent. 



T. ordinoides biscutatus. — p. 834. 

 eee'. — Dorsal line usually absent, or short, or in- 

 distinct, 

 fff. — Remnant of dorsal line usually present, pre- 

 ocular single, infralabials often more than 1 0. 

 T. ordinoides couchii. — p. 838. 

 fff. — No dorsal line, often more than one pre- 

 ocular, infralabials rarely more than 1 0. 

 gg. — Lateral lines usually present, dorsal spots 

 fewer, or absent. 



T. ordinoides hammondii. — p. 843. 

 gg'. — Lateral lines usually absent, dorsal spots 

 very numerous and prominent. 

 T. angustirostris. — p. 85 5. 

 . — Lateral stripe anteriorly upon scales of the third row 

 only, light postoral crescents present. 



T. marcianus. — p. 849. 

 -Lateral light stripe anteriorly involving the scales of 

 the fourth row. 



T. megalops. — p. 852. 



