This might be another Cyphonia species. I’ve seen a few similar ones before, but not one quite like this.
I believe these photos are all of the same individual, but I can’t be sure. It was skittish, but when spooked it always seemed to land close by.
These really are very small treehoppers, only around 3mm long.
Very nice!
The long suprahumeral horns, trifurcate posterior process, and two slender upright median spines confirm the genus Cyphonia. There are many species in Brazil, but one old key (Goding 1929: p. 250) suggests it could be the common species C. capra.
Thanks, Ted!