836 13. COLVBRIDJE 



the scales, no lines being evident. Some dark specimens 

 resemble, in coloration, certain examples of T. ordinoides 

 atratus, 



Length to anus 375 +55 500 503 550 620 



Length of tail 132 135 155 175 175 175 



Variation. The loreal is 1 1 in all specimens exanv 

 ined. Preoculars are 2 2 in one hundred and fifty-nine, 

 or 63%; 1 2 in twenty-five, or 10%; 1 1 in sixty-three, 

 or 25%; and 2 3 in one. Post oculars are 3 3 in two 

 hundred and thirteen, or 80%; 3 4 in twenty-six, or 

 10%; 4 4 in five, or 2%; 2 3 in three, or 1%; and 

 4 1 in one. Temporals are 1+2 1+2 in one hundred 

 and ninety, or 77%; 1+3 1+3 in sixteen, or 6%; 

 1+2 1+3 in thirty-nine, or 15%. The supralabials are 

 8 8 in two hundred and thirty-two, or 92%; 7 8 in 

 eleven, or 4%; and 7 7 in four, or 1 %. The infralabials 

 are 10 10 in two hundred and twenty-two, or 88%; 

 9 10 in thirteen, or 5%; 9 9 in eight, or 3%; 10 11 

 in two, and 8 8 in one. The scale-rows are 21 21 17 

 in two hundred and sixteen, or 87%; 21 19 17 in nine, 

 or 3%; 212317 in six, or 2%; 211717 in three, 

 or 1%; 191717 in three, or 1%; 191917 in two, 

 191715 in two, 231917 in two, 232119 in 

 one, 17 17 17 in one, and 20 21 17 in one. The 

 gastrosteges vary in number from 151 to 183, males hav- 

 ing from 157 to 183, females from 151 to 176; the aver- 

 age in one hundred and twenty males is 171, in one hun- 

 dred and twenty-three females, 166. The urosteges vary 

 from 63 to 97, males having from 76 to 97, females from 

 63 to 91; the average in one hundred and twelve males 

 is 84, in one hundred and three females, 77. 



Distribution. This snake was first described from speci- 



