I don't recognize it -- it might be an European species.
But how big is your plant? If not very big and not very many, all you have to do is keep plucking them off of the plant(s). Since they make a nest and not go hiding somewhere else, it will be easy to find them and capture.
Thorough search of underside of the leaves may reveal eggs, too. Just rub them off.
If you are not squeamish, simply squish them all with your fingers. If not up to doing that, wear gloves or use forceps or chopsticks, just drop them in container of soapy water to kill them.