13. COLUBRIDM 



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 — 

 17. 

 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 1 9 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 1 9 rows. 



