20 



Key 



This identification key is based on those in Wilson (1982a, 1982b, 1987a) and Wilson et al. 

 (1999), as well as other published and unpublished information. 



1. Dorsum of body with lineate or transversely-banded pattern 2 



Dorsum of body unicolor or nearly so 39 



2. Dorsum of body with transversely-banded pattern 3 



Dorsum of body with lineate pattern 5 



3. Dorsal pattern of black-bordered pale crossbars on a dark red ground color (reddish brown 

 to brown in preservative), frequently divided middorsally, with right and left portions 



displaced longitudinally and alternating with one another - T. supraciricta 



Dorsal pattern not as above - 4 



4. Dorsal pattern of narrow transverse cream bands restricted to the anterior portion of the 



body on a bluish black to black ground color — - T. shawi 



Dorsal pattern of black crossbands over length of body on pale ground color 



— — - — T. semicincta (part) 



5. Dorsal pattern of at least one dark middorsal stripe 6 



Dorsal pattern of at least one pale middorsal stripe, well defined or not, present length 

 of body or not — - 17 



6 Subcaudals fewer than 30 (19-28) T. vermiformis 



Subcaudals more than 30 - 7 



7. Dark nape band absent, pale nuchal spots in contact or confluent with dorsal ground 

 color — - 8 



Dark nape band present, pale nuchal markings separated from dorsal ground color — 12 



8. Supralabials 6, rarely 5 - 9 



Supralabials 7, rarely 6 - — 10 



9. Two postoculars; dark lateral stripe present only on forebody — T. cascadae 



Single postocular, dark lateral stripe extends length of body ~ T. calamahna 



10. Seventh supralabial in contact with parietal, separating anterior temporal from posterior 



one T. coronadoi 



Seventh supralabial separated from parietal, anterior and posterior temporals in contact 

 with one another — 1 1 



