242 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



34. Fort Hall, Bingham Co., Idaho. 



35. Bear River, Logan, Cache Co., Utah. 



36. Woods Cross, Morgan Co., Utah. 



37. Oak Creek, Coconino Co., Arizona. 



38. San Pedro Martir Mountains, Lower California, 

 Mexico. 



Material. — One hundred specimens have been included in 

 the present study. 



Variation. — The variations shown by these specimens are as 

 follows : 



The loreal is 1 — 1 in all specimens. Preoculars 1 — 1 in 

 eighty-one, or 81% ; 2 — 2 in thirteen, or 13% ; 1 — 2 in five, or 

 5% ; and 2 — 3 in one, or 1%. Postoculars are 3 — 3 in eighty- 

 eight, or 88% ; 2 — 3 in four, or 4% ; 3 — 4 in four, or 4% ; A — 4 

 in three, or 3% ; and 2 — 2 in one, or 1%. Temporals are 1+2 

 — 1+2 in sixty-seven, or 67 7o ; 1+2 — 1+3 in twenty, or 20% ; 

 and 1+3 — 1+3 in thirteen, or 13%. The supralabials are 

 8 — 8 in eighty-nine, or 89% ; 7—8 in eight, or 8% ; and 7—7 

 in three, or 3%. The infralabials are 10 — 10 in eighty-six, or 

 86% ; 9—10 in seven, or 7% ; 10—11 in four, or 4% ; 9—8 in 

 one, or 1%; and 11 — 11 in one, or 1%. The scale-rows are 

 21—21—17 in fifty-five, or 55%; 21—19—17 in thirty-three, 

 or 33%; 19—21—19—17 in four, or 4%; 19—21—17 in 

 three, or 3% ; 19—19—17 in one, or 1% ; 20—21—19—17 in 

 one, or 1% ; and 20 — 21 — 17 — 17 in one, or 1%. The gastro- 

 steges vary in number from 148 to 182, males having from 

 159 to 182, females from 148 to 177; the average in fifty-three 

 males is 174.2, in forty-seven females, 169. The urosteges 

 vary from 67 to 95, males having from 79 to 95, females from 

 67 to 83 ; the average in forty-four males is 86, in thirty-five 

 females, 76. 



This variation is shown in full in the following table of 

 scale-counts. 



