820 13. COLUBRWM 



in three hundred and thirty-nine, or 93%; 2 2 in fifteen, 

 or 4%; 1 2 in seven, or 1%; and 2 3 in one. Post ocu- 

 lars are 3 3 in three hundred and twenty-one, or 88%; 

 3 4 in fifteen, or 4%; 2 3 in ten, or 2%; 2 2 in eight, 

 or 2%; 4 4 in six, or 1 %; A 5 in one, and 1 2 in one. 

 Temporals are 1+2 1+2 in two hundred and eighty, or 

 77%; 1+21+3 in forty-four, or 12%; 1+31+3 in 

 sixteen, or 4%; 1 + 11 + 1 in ten, or 2%; 1 + 11+2 

 in five, or 1%; 1 + 1 2+2 in two, 1+2 2+2 in two, 

 1 + 1 1+3 in one, and 1+3 2+2 in one. The supra- 

 labials are 8 8 in three hundred and nine, or 85%; 7 7 

 in twenty-six, or 7%; 7 8 in twenty-five, or 6%; 8 9 

 in one, and 9 9 in one. The infralabials are 10 10 in 

 two hundred and seventy-two, or 75%; 9-10 in forty-four, 

 or 12%; 9-9 in thirty-two, or 8%; 10-11 in five, or 1%; 

 8 9 in three, 8 10 in three, 1 1 1 1 in two, and 8 8 in 

 one. The scale-rows are 19 19 17 in two hundred and 

 fifty-five, or 71%; 19 21 17 in twenty-seven, or 7%; 

 21 21 17 in twenty-two, or 6%; 19 21 19 in twenty- 

 one, or 6%; 21 21 19 in nine, or 2%; 21 19 17 in 

 six, or 1%; 171917 in four, or 1%; 191919 in 

 three, 192019 in three, 202119 in one, 1718 

 17 in one, 19 19 15 in one, and 20 21 17 in one. The 

 gastrosteges vary in number from 140 to 172, males having 

 from 146 to 172, females from 140 to 168; the average in 

 one hundred and fifty males is 158, in two hundred and 

 four females, 153. The urosteges vary from 52 to 93, 

 males having from 63 to 93, females from 52 to 86; the 

 average in 131 males is 81, in 168 females, 74. 



It now is well known that variation in the coloration of 

 the snakes of this subspecies is very great. Certain types of 

 coloration may be pointed out as occurring in groups of 

 specimens. The best known of these color types, perhaps, 

 is that in which the general color is dark olive, lateral lines 



