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Acanalonia conica http://bugguide.net/node/view/306338
Neil, these bugs are complex and we will go crazy, but please check the link. Your flatid bug has a pointed tip at the back, like a rose thorn. The Wiki link to Acanalonia has a rounded back wing (and other differences) and you'll surely find some of them soon. Nice pic too.
Ceherzog is right on the dot with this one. I love planthoppers, it's a shame they're so unappreciated.
Lat: -26.16, Long: 27.92
Spotted on Apr 28, 2011 Submitted on Apr 28, 2011
and 2 other people favorited this spotting