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Sphacophilus sp.
Mostly black with an orange thorax. Forked antennae
Withlacoochee State Forest Citrus Tract on Feay's Prairieclover (Dalea feayi)
Very odd little sawfly. Bugguide has had a hard time placing this because the forked antennae in combination with the other body features don't seem to be a great match for anything in the guide.
I'm not sure of the suggestion above having done a little more research. It may be a Arge sp. instead. The forked antennae occur on the male of some species. I don't see any with forked antennae in bugguide or google searches. I think bugguide would be very interested in adding this photo and I'm sure they can provide an accurate ID. Please consider posting it there.
http://bugguide.net/node/view/19836/bgpa...