Found crawling slowly four or five feet up a birch tree. I first thought this was a net*wing beetle larva. It reminded me strongly of Ly*cus larvae I have found on my two recent trips to New Mexico. However, I now see that this one has a much different head. Has an upper and lower row of fleshy backwards-curved lobes on each side, although the lower ones are difficult to see in these views. This one is carrying a bunch of pale mites around the base of its head.