The Bzzit Khaht as it appeared on screen
The Bzzit Khaht are a Federation member species. A representative of this race was present in the Federation Council in 2286, laying witness to the Klingon ambassador's demands for James T. Kirk's death. (Star Trek IV: The Voyage Home)
Background
A Bzzit Khaht
The name of this species comes from FASA's Star Trek IV Sourcebook Update. While strictly a non-canon source, it is the only widely recognized source for names of the Star Trek IV aliens. This same source also specifies the Bzzit Khaht's homeworld as Althos IV.
The Bzzit Khaht representative was sitting in the back row on the left podium (left when looking from the entrance towards the viewscreen), close to the viewscreen.