Looks similar to what I have. It has stung the leaves on my Oak trees and other bushes. It causes a brown circle in the middle of the leaves. It has also stung my papaya fruits causing them to drop off prematurely. I was told it is a wasp.

It's a hawk moth. I have them all over my papaya plants this time of year. They are one of the few insects that pollinate papayas. To the best of my knowledge, they do not harm the fruit or leaves of plants (other than the foliage the larvae eat).