25 



49. Entire head dark above and below to point 3 to 4 scales posterior to parietals 



T. cucullata (part) 



Head pattern not as above 50 



50. Pale nuchal band absent 51 



Pale nuchal band present 53 



5 1 . Head cap convex or pointed posteriorly T. nigriceps 



Head cap straight edged posteriorly T. ooUtica (part) 



52. Hemipenis with 1 basal hook; ventrals 1 15-142 T. relicta (part) 



Hemipenis with 2 basal hooks; ventrals 135-146 T. oolitica (part) 



53. Pale nuchal band crossing posterior portion of parietals 54 



Pale nuchal band bordering parietals or present 1-3 scales posterior to parietals — 63 



54. Dorsum of body coral red, reddish brown, or reddish tan T. rubra 



Color of dorsum of body not as above 55 



55. Ventrals 160 or more 56 



Ventrals fewer than 160 58 



56. Dark nape band 3 or more scales in length T. melanocephala (part) 



Dark nape band 2 or fewer scales in length 57 



57. Secondary temporal elongate; ventrals 140-164; black head cap extending ventrally to or 



below comer of mouth, including parts of 6th and 7th infralabials T. wilcoxi (part) 



Secondary temporal about same size as dorsal body scales; ventrals 160-195; 



black head cap does not reach comer of mouth nor extend below it onto 6th and 



7th infralabials T. bocourti (part) 



58. Dark nape band 1.5 scales long or fewer ~ T. wilcoxi (part) 



Dark nape band usually 2 scales or more in length 59 



59. Pale nuchal band present, usually divided both medially and laterally 



T. melanocephala (part) 



Pale nuchal band present or not; if present, usually complete or divided only 



medially 60 



60. Dark nape band bounded posteriorly by pale neck band T. capistrata 



No pale neck band present posterior to dark nape band - 61 



