Within an hour the pupa begins to emerge. At this point, it still looks like a larva, but there is a pupa underneath the larval skin. Notice that this larva has an accordian-like appearance. You can see what causes this in the next set of photos. After a 9-14 day maturation period, the larva is 3,000 times its birth weight.
Cool temperature slows biological activity and thus can prolong the maturation period of each stage.