22 



17. Dorsal pattern of pair of dark dorsolateral fields three and two half scales in width* 



flanking pale middorsal stripe occupying middorsal scale row and adjacent halves of 



paravertebral rows on otherwise pale ground color T. semicincta (part) 



Dorsal pattern not as above 18 



18. Pale middorsal stripe absent 19 



Pale middorsal stripe present 23 



19. Pale lateral stripe present the length of body 20 



Pale lateral stripe interrupted along middle of body or present only on anterior 

 portion of body 2 1 



20. Pale nuchal band reduced to two nuchal spots; pale lateral stripe well developed 



-- — T.jani (part) 



Pale nuchal band complete; pale lateral stripe barely discernible T. cuniculator 



21. Pale lateral stripe present, but interrupted along middle of body T. briggsi 



Pale lateral stripe confined to anterior portion of body 22 



22. Pale nuchal band poorly developed, confined to scales posterior to parietals, subcaudals 



fewer than 60 (44-49) - T. tayrae (part) 



Pale nuchal band well developed and crossing posterior portion of parietals, subcaudals 

 more than 60 (single value known, 62) — T.johnsoni 



23. Pale middorsal stripe poorly developed, consisting of a series of small disjunct spots 



confined to some amount of the anterior ponion of body or present its length, or a 



slight paling of the color of middorsal row 24 



Pale middorsal stripe well developed, confined to middorsal row or occupying 

 middorsal row and adjacent portions of paravertebral rows 28 



24. Pale nuchal band divided both medially and laterally, upper segments appearing as a 



pair of pale spots — T.jani (part) 



Pale nuchal band complete or middorsally divided 25 



25. Pale nuchal band poorly developed, confined to scales posterior to parietals, divided 



broadly middorsally or both middorsally and laterally - T. tayrae (part) 



Pale nuchal band well developed, complete or middorsally divided, beginning on the 

 middle to posterior portion of parietals 26 



26. Pale lateral stripe present, occupying adjacent portions of dorsal rows 3 and 4 



-- T. vulcani 



Pale lateral stripe absent — — 27 



