Looks like either a blister beetle or a vine weevil but it is hard to tell, as it sort of looks like they're sleeping. It might be worth coming out at night with a flashlight and seeing if there is more than one perpetrator.

Whatever it is, it is a sucking insect, not one that chews, so eliminates both blister beetles and vine weevils.

They almost look like black bean aphids but the magnification makes it difficult to judge scale. And it may be something else has disfigured the clem and that is now attracting insects as a secondary problem.

Gardengal, you nailed it. I did some research on black bean aphids and that's what they are. Thank you!

Deanna