836 13. COLUBRIDZA 
the scales, no lines being evident. Some dark specimens 
resemble, in coloration, certain examples of T. ordinoides 
atratus. 
Length to anus _________. 375 455 500 503 550 620 
Length of tail __ eat! 132 135 155 175 175 75 
Variation.—The loreal is 1—1 in all specimens exam- 
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% 3 and 2—3 in one. Postoculars are 3—3 in two 
hundred and thirteen, or 80%; 3—4 in twenty-six, or 
10%; 44 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% 3; 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%; 2i—19—17 in nine, 
or 3%; 21—23—17 in six, or 2%; 21—17—17 in three, 
or 1%; 19—17—17 in three, or 1%; 19—19—17 in two, 
19—17—15 in two, 23—19—17 in two, 23—21—19 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- 
