If you do a double download, you will see that that is not a wasp but what looks to be a common green bottle fly on that one caterpillar...
nikonbug wrote:
Nooo, this is actually the non photography section. And those are Tomato Horned Caterpillars. They will strip a tomato plant, and wont touch your roses.
And the wasp on the head of the lower one is a Parasitic Wasp. It will lay eggs on the caterpillar on stalks. When they hatch, they crawl into the cat and eat it from the inside out. If you see them, let the cat live as it produces more wasps.