Unfrotunately I cannot tell what these beetles are from your photos. And proper identification is key to controllling them if that is what you want to do.
Put a few in a jar with some alcohol and take it to the extension office in your county for identification. Call ahead of time to see what hours they are open to the public. Lane County's phone number is 541-344-5859.
Sorry I could not be of more help. It is hard to get in focus pictures with such a tiny subject.