Potato Pests

I need your help. I have just found many insects on our potato leaves and the leaves are splotchy brown and curling up and dying. I think they are laying eggs. They are about 3/8-1/2 " long and look like an ant with wings. Can you see them in this photo?

I just sprayed a whole bottle of Sevin on the plants and we are infested! Any help is appreciated. I don't want to lose a whole crop of taters. Also, do they just affect the leaf, or the potato as well? We did not have this problem last year.