Subject: What is this?
Geographic location of the bug: Johannesburg, South Africa
Time: 04:18 AM EDT
Your letter to the bugman: Found this bug outside my garage on a wall. Looks like a horn on the back with long antennas
How you want your letter signed: J
This is quite an unusual looking Spider, but we have not had any luck with its identity. We will continue to research this matter.
Update: Cesar Crash of Insetologia posted a comment indicating this looks like a Crab Spider in the genus Tmarus, but the FlickR posting he directed us to is not from South Africa, but rather from Portugal. Though the submitted Spider is very delicate looking for a Crab Spider, the front two pairs of legs are considerably longer than the rear two pairs, which is a good indication the family Thomisidae is correct.