13. COLUBRID.^ 



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

 or 4%; 1 — 2 in seven, or 1 %; and 2 — 3 in one. Postocu- 

 lars are 3 — 3 in three hundred and twenty-one, or 88/o; 

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



or 2% J 4 4- in six, or 1 %; 4 — 5 in one, and 1 — 2 in one. 



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

 77% J 1+2—1+3 in forty-four, or 12%; 1+3—1+3 in 

 sixteen, or 4%; I + l — 1 + 1 in ten, or 2%,; 1 + 1—1+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%; 17—19—17 in four, or 1%; 19—19—19 in 

 three, 19—20—19 in three, 20—21—19 in one, 17—18— 

 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 



