It's quite possible that the integrade distribution in that area is more heavily influenced by splendida than california or nigrita, or that the range maps are incorrect.
The range maps often are made from data that are years old, and usually do not result from examining specimens in every single local population.
If the kings in that area look like a splendida with no influence of nigrita or california, that's what I would call it, but noting possible influence from the other species, noting the locale where it was collected.
One thing that is possible is that splendida use to have a larger western range that has given way to integrades with california kings, with your population being an isolated population where the integration has not taken place. Or its possible that they are integrades, but just much more heavily influenced by splendida.
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3.0 WC; 0.1 CB L. getula californiae
0.1 CB L. pyromelana pyromelana
0.1 WC; 10 eggs (7/11) Elgaria multicarinata multicarinata