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. 
ff’—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 10. 
T. ordinoides couchii.—p. 838. 
fff’—No dorsal line, often more than one pre- 
ocular, infralabials rarely more than 10. 
gg.—Lateral lines usually present, dorsal spots 
fewer, or absent. 
T. ordinoides hammondii.—p. 843. 
ge’.—Lateral lines usually absent, dorsal spots 
very numerous and prominent. 
T. angustirostris.—p. 855. 
b’.—Lateral stripe anteriorly upon scales of the third row 
only, light postoral crescents present. 
; T. marcianus.—p. 849. 
a’.—Lateral light stripe anteriorly involving the scales of 
the fourth row. 
T. megalops.—p. 852. 
