J.W.
My son, who is 2-1/2 now, dropped his second nap around the same age. We switched to one afternoon nap, sometime between 12:00-2:00, depending on what time he got up in the morning. He now takes a 2-3 hour afternoon nap, but he is a sleeper. Other friends of mine, whose children are not such good sleepers, also cut out the morning nap in favor of a longer afternoon nap. I would suggest keeping him up longer in the morning and trying one afternoon nap only.