One of the reasons for my request for more pics was just for what you mentioned. I 'thought' I saw those horns/protrusions, but I wasn't sure. As far as sexual-dimorphism is concerned, maybe. I'd have to look into it.

The trainaglar horn you mentioned also is enhanced or reduced depending on the angle of the photograph. These horns can greatly help in IDing them, but the image would have to best match that of what one is using to ID it.

Also, remember that I used both the image and the general location cited by S&N to narrow down possibilities. Some other images really looked pretty close to yours. Since you have the S&N book, check out what I said and see what you think.

The variations/locations/subsp galore of Protaetia make me feel 'dumb' with that genus. There are simply SO many possibilities.