That's fine, just didn't come off that way in this particular thread.
V reisengeri is in the 'prasinus complex' which are the true tree monitors. These are the lithe, long monitors that you think of as the typical tree monitors.
V melinus is more similar to a small doreanus. These are typically called Quince monitors. They're a bit longer and tend to be generally thicker, I'm sure you know what I mean. The melinus are also a bit less arboreal.
This being said, I find Thyssa to be clearly melinus by pictures although I'm no expert. They'll both required hot basking spots, lots of climbing and higher humidity, but I have heard from keepers that melinus tend to stay lower in the cage and will dig more than the tree monitors.
Here's a quick summary of natural history: http://www.monitor-lizards.net/speci...s/melinus.html
And check out Biawak Volume 4 Number 3 for an account of breeding this species that covers housing and general care.