Bang on Time

His Imperial Majesty is currently skin changing, into the 4th instar, which is exactly what he should be doing at this time of year.  I checked three wild larvae today.  Two of these were changing their skins, the third had just done so - 

The cast skin is visible near the leaf tip.  

My three captive larvae are all changing their skins.  

Vote Purple!  You Know It Makes Sense...