Will try to post a picture when daylight comes around.

Heather

If they are Box Elders, you can kill them by spraying them with diluted liquid dishwashing soap.

They don't do a lot of damage, but they are a nuisance and if they're near the house, they will try to move in when the weather turns cold.

V., who knows these guys all too well!

"They seem to be killing one of my Rhodies"

What exactly are they doing to stress your Rhododendron, are you seeing "leaf notches", "fress" , drooping leaves, total branch dying??, etc.