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



56. Garcia River, half mile above mouth, Mendocino Co., 

 Cal. 



57. Sherwood, Mendocino Co., Cal. 



58. Willits, Mendocino Co., Cal. 



59. Mendocino, Mendocino Co., Cal. 



60. Albion River, 2 miles below Comptche, Mendocino Co., 

 Cal. 



61. Kidd Creek, Sonoma Co., Cal. 



62. Skaggs Springs, Sonoma Co., Cal. 



63. Napa, Napa Co., Cal. 



64. Inverness, Marin Co., Cal. 



65. Point Reyes Station, Marin Co., Cal. 



66. Tocaloma, Marin Co., Cal. 



67. Willow Camp, Marin Co., Cal. 



Material. — Two hundred and forty-six specimens have been 

 studied by us. 



Variation. — The loreal is 1 — 1 in two hundred and thirty- 

 seven specimens (all counted). The preoculars are 1 — 1 in 

 two hundred and thirty-six and 2 — 2 in one. The postocu- 

 lars are 3 — 3 in two hundred and fifteen or 92% ; 3 — 4 in thir- 

 teen or 5% ; 2 — 3 in four, or 2% ; A — 4 in one, and 2 — 2 in one. 

 The temporals are 1+2 — 1+2 in two hundred and twenty-one, 

 or 94%; 1 + 1—1+2 in five, or 2%; 1+2—1+3 in four, or 

 2% ; i + l—l-fl m four, or 2% ; and 1+3—1+3 in one. The 

 supralabials are 7 — 7 in one hundred and eighty-three, or 77% ; 

 7 — 8 in forty-one, or 17% ; and 8 — 8 in fourteen, or 6%. The 

 infralabials are 10 — 10 in one hundred and sixty-nine, or 71% ; 

 9—10 in forty-one, or 17%; 9—9 in fifteen, or 6%; 8—9 in 

 eight, or 3% ; 8 — 10 in two, or 1% ; and 10 — 11 in two, or 1%. 

 The scale-rows are 19 — 19 — 17 in all specimens. The gastro- 

 steges vary in number from 146 to 170, males having from 150 

 to 170, females from 146 to 167; the average in ninety-nine 

 males is 164.3, in one hundred and eighteen females, 156.4. 

 The urosteges vary from 66 to 95, males having from 70 to 95, 

 females from 66 to 91 ; the average in eighty males is 84.2, in 

 eighty-eight females, 76.8. 



These variations are shown in full in the following table of 

 scale-counts. 



