788 13. COLUBRIDZ 
Synopsis OF SPECIES AND SUBSPECIES 
a.—Lateral light stripe anteriorly not involving scales of the 
fourth row. 
b.—Lateral stripe anteriorly upon scales of the second and 
third rows. 
c.—Supralabials normally seven. 
d.—Eye large, posterior genials much longer than an- 
terior, infralabials usually 10, scale-row 19—19— 
Lie 
e.—Gastrosteges (146 to 170) and urosteges (66 to 
95) average fewer in number (156—166 and 76 
to 85). 
f.—Coloration lighter, with broader light lines. 
T. sirtalis parietalis.—p. 792. 
f’.—Coloration usually darker both above and be- 
low, lines often narrower. 
T. sirtalis concinnus.—p. 795. 
e’.—Gastrosteges (156 to 177) and urosteges (74 to 
97) average more numerous (163 to 169 and 
83 to 90), coloration lighter than in f’. 
T. sirtalis infernalis.—p. 802. 
d’.—Eye much smaller, posterior genials about equal 
to anterior, infralabials usually fewer than 10, 
scale-rows usually 17—17—15. 
T. ordinoides ordinoides.—p. 812. 
c’.—Supralabials normally eight. 
dd.—Scales usually in not more than 19 rows. 
ee.—Gastrosteges average more than 160, eye large, 
posterior genials longer. 
T. eques.—p. 808. 
ee .—Gastrosteges average fewer than 160, eye small, 
genials subequal. 
T. ordinoides atratus.—p. 817. 
dd’.—Scales usually in more than 19 rows. 
