Smiliine Treehopper

Entylia carinata, a brown camouflaged treehopper, belongs to the tribe Polyglyptini, subfamily Smiliinae. Smiliine treehoppers differ from others in that they have a large pronotum which extends back over the abdomen and often covers the head. E. carinata has a gap in its pronotum, giving it the appearance of a "keel."

These treehoppers have a mutualistic relationship with ants: the ants fend off predators and/or parasites and collect sugary fluid secreted by the hoppers.

I found my specimen on sunflower, one of many herbaceous plants that this treehopper frequents (but does not damage). It could belong to the subspecies Entylia carinata concisa.

References:
http://bugguide.net/node/view/10205 (E. carinata)
http://bugguide.net/node/view/311473 (E. c. concisa)
http://www.americaninsects.net/h/entylia-carinata.html
http://www.marylandbiodiversity.com/viewSpecies.php?species=6252
http://davesgarden.com/guides/bf/go/5191/#b