788 13. COLUBR1DJE 



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 1 60, eye small, 



genials subequal. 



T. ordinoides atratus. p. 817. 



dd'. Scales usually in more than 1 9 rows. 



