Whats eating the Clematis leaves?

[Wendie537]

New gardener....
This clematis is a few years old, and doesn't bloom much, I moved it to a sunnier location and it seams to be growing better but still no blooms and something is eating the leaves..It's located between two rose bushes that were being eaten by sawfly larve..doesn't seam to be the same chew pattern and I've never seen anything on the leaves...

 

[Marck]

Go out an hour after dark with a flashlight and see what you can find. This is a great way to discover nocturnal pests that hide during the day. Possible suspects include Caterpillars or Cutworms (Lepidoptera), Beetles (Coleoptera), Sawfly larvae (Symphyta, Hymenoptera), various Orthoptera, etc. Interestingly, Earwigs (Dermaptera) also have a reputation for eating Clematis.
Of course, Slugs and Snails (Eupulmonata, Gastropoda) are another possibility, but the worst damage being at the top of the plant suggests otherwise.