Would love to know what this handsome fellow enjoying our dahlias might be. He's about an inch and a half long. I thought the somewhat "angular" rear end reminded me of some hawk-moth caterpillars, but he lacks the horn that they often have, and didn't seem to match anything in my moth book.... any help will be much appreciated.
I was presuming that this caterpillar was taken in the UK.If you are from America this is likely to be a Hitched Arches moth ( melanchra adjuncta ).This caterpillar varies from green to brown ,like your example.
Yes, it's from the UK - Oxfordshire, to be more exact. So I'd agree with your identification as the Dot - that looks right. My copy of South allows the colour to be either green or brown.
He seems to have disappeared, at least from the particular place we'd been watching him last week, so I'm hoping he's found a snug place to pupate (rather than having an unfortunate encounter with a bird!).