Infested Blue Gum Eucalytptus (Almaden Lake Park). The first photo shows a dead beetle. I don't know why it's white, but I've seen many like this. Note the chewing damage in the leaf litter.
NOTE: This tree is representative of over 50 eucalyptus trees in this park. I closely inspected 6 of them and found evidence on all of them of chewing damage and lerp psyllid infestation. The beetles are harder to find - you have to peel back the bark. This is a very popular park, and people were giving me dirty looks for peeling back the tree bark, so I stopped after getting these pictures.