caterpillar

caterpillar

Observation - caterpillar - UK and Ireland. Description: This caterpillar was found on a tree trunk. The overall colour was ashy grey with hints of purplish patches. There was a line of red spots down each side. It was about 50 - 60mm long and appeared to be in a rather sickly state the body looked a little blo

This caterpillar was found on a tree trunk. The overall colour was ashy grey with hints of purplish patches. There was a line of red spots down each side. It was about 50 - 60mm long and appeared to be in a rather sickly state the body looked a little bloated and was not firm. Any ideas as to ID please.