Beetle Larva ID Assistance?

I live in Southern California, found these grubs in damp soil at the base of a tree. 2.5cm length. Thought maybe Cotinis mutabilis, but it doesn’t crawl on its back. Has single anal slit, can’t tell a particular raster pattern. Could it be a Lucanid? Thanks!
 

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It might be a stag beetle but it might be one of the small brown may beetles I live in SoCal and I see them all the time in the spring 

 
Your home must have lot's of red rot wood if it were to be a Ceruchus which I'm interested in purchasing. 

 
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One of the scarab larvae that are difficult to ID without examining raster and few other characters. Many are considered lawn pests. 

 
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