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Thanks anyway, Bayucca and Ashish. I am looking for an ID for these, I found something but nothing really conclusive, The Portuguese helmet treehoppers I found had a much larger back shield. I think that I'll find something soon, although we have so few sources for brazilian insects.
Yes, that might be an explanation and treehoppers are known to show some "mass" at the same branch or leaf. I just did not have the time to look closer at these ones.
Bayucca, I am sure they are all the same species, it was a rather large group gathering together. Difference in colors may be due to sexual dimorphism (I don't know that it exists among treehoppers, but I am not an expert), different stages of development, or those differences between individuals are common in this species. The following spotting was made at a very different place, circa 1,000 Km from this one, and shows a similar species, where individuals also have different colors:
http://www.projectnoah.org/spottings/112...
I had the treehopper on my screen and was looking for some matching species, but did not found any. In the meanwhile Ashish IDed this one as Dorsata. Looking at EOL and some others I am not sure if this really is Dorsata. This one would have some longer white part on the anterior/upper part above the head, which Sergio's has not, meaning only half of length of the white stripe or better only until the middle of the anterior shield or however you called this helmet. In addition I am not sure if they are all the same ones?? Look at the amount and location of white spots/patches.
Fabulous spot! great detailed photos. Amazing how many different treehopper and leaf hoppers there are.