A student of mine gave me these two grubs two months ago. I have had them buried in sand feeding them roots and dry dog food. The grubs buried themselves to a depth of about 6 inches in sand. About three weeks ago they surfaced and stopped moving about going into a dormant stage preparing for pupation. There they sat (one is still to pupate) until a week ago when the one began to pupate. The larval skin is still evident at the end of the abdomen. One can see the head of the grub skin. It is fascinating watching these change. I will add more photos as I notice changes. These beetles are beginning their emergence in this area as well.