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



20. Mouth of Palm Canyon, San Jacinto Mountains, River- 

 side Co., Cal. 



21. Tahquitz Valley, 8000 feet, San Jacinto Mountains, 

 Riverside Co., Cal. 



22. San Diego Co., Cal. 



23. Agua Caliente, San Diego Co., Cal. 



24. Oak Grove, San Diego Co., Cal. 



25. Near Carlsbad, San Diego Co., Cal. 



26. Santa Isabel Valley, San Diego Co., Cal. 



27. Witch Creek, San Diego Co., Cal. 



28. Cuyamaca Mountains, San Diego Co., Cal. 



29. Sweet Water Dam, San Diego Co., Cal. 



30. Dulzura, San Diego Co., Cal. 



31. Campo, San Diego Co., Cal. 



Material. — Seventy-five specimens from these thirty-one lo- 

 calities in California have been included in this study. 



Variation. — These specimens show the following variations: 



Loreal 1 — 1 in all specimens. Preoculars 2 — 2 in thirty-one, 

 or 42%; 1 — 1 in twenty-seven, or 36%; 2 — 1 in thirteen, or 

 18% ; 3 — 3 in two, or 3% ; and 2 — 3 in one, or 1%. Postocu- 

 lars 3 — 3 in sixty-six, or 92% ; 3 — 4 in three, or 4% ; 4 — 4 in 

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

 forty-two, or 56% ; 1+2—1+3 in twenty-one, or 28%o ; 1+3— 

 1+3 in twelve, or 16%. The supralabials are 8 — 8 in all ex- 

 cept one specimen which has 8 — 9. The infralabials are 10 — 10 

 in sixty-nine, or 92% ; 10 — 9 in three, or 4% ; 9 — 9 in two, or 

 3% ; and 10 — 11 in one, or 1%. The scale-rows are 21 — 21 — 

 17 in sixty-two, or 83% ; 21—19—17 in eleven, or 15% ; 19— 

 21—17 in one, or 1%; and 19—19—17 in one, or 1%. The 

 gastrosteges vary from 156 to 173, males having from 163 to 

 173, females from 156 to 171; the average in thirty-seven 

 males is 168.1, in thirty- four females, 162.6. The urosteges 

 vary from 67 to 88, males having from 69 to 88, females from 

 67 to 82; the average in twenty-five males is 81.2, in twenty- 

 one females, 73.1. 



This variation is shown in full in the following table of 

 scale-counts. 



