This is another that has me stumped, when I took the photos I was sure I was taking a photo of an ant but on seeing the photo I now realize that it is obviously not. Saying that the resemblance to an ant could be part of its evolutionary defence.
I am struck by three things, a) the strong hind legs - which make me immediately think Orthoptera (grasshopper, crickets and Katydids) b) the long antenna - which is making me think Tettigoniidae (i.e. Katydid) and c) the blue colouring in the legs which is hinting Orthoptera again.
I am going to stick my neck out and hazard a guess of a Katydid nymph (i.e. on of the stages on route to adult hood). What do you think?
Have just got back from holiday and one of the books I took to read was Piotr Naskrecki's excellent The Smaller Majority. And on page 134 there is an almost identical mimicking labelled as "Eurycorypha sp." I did a bit of digging this morning to find an online version of Piotr's photo lablelled as "Katydid (Eurycorypha sp) nymph, Guinea, West Africa"