Forth instar

My Sallow kitten Furcula furcula larvae are doing very well, and are now in their 4th instar, having shed their skin 3 times, each time becoming more interesting and colourful. 
I think they will shed their skin once more, then pupate in a cocoon made of chewed up bark which is almost impossible to see and very strong - best start looking for suitable twigs for them I think!