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Pterodycta reticularis
Planthopper
On a tree trunk
bayucca is right again....Pterodictya reticularis! Good call! Tom, your info is good...this planthopper typically occurs on that spiky tree (embarrassingly, I forget the scientific name of that tree just now; colloquially, we call it the 'monkey-no-climb' tree!).
The locals said this hopper is only found on this one kind of tree with the spiky bumps on the trunk.
Yes, you did help me on a few tropical IDs a few months ago. This site is a great resource, and I'll be adding a bunch more bugs here that I found in Central and South America.
Welcome and welcome to Project Noah, Tom Murray ;-)... I think we met already on some IDs...