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Phymateus sp., looks similar to Phymateus aegrotus. There are other similar ones: Phymateus cinctus = Phymateus stollii (which is probably not found in Eastern Africa).
http://orthoptera.speciesfile.org/Common...
I don't think it is Phymateus viridipes:
http://www.projectnoah.org/spottings/110...
http://orthoptera.speciesfile.org/Common...
http://www.saltatoria.info/deutsch/arten...
Note the comment on this one: Aegrotus not Stollii:
http://www.flickr.com/photos/48573660@N0...
Sceptic ID in my eyes:
http://www.pbase.com/joharnois/image/127...
Please, verify!