These beetles have been identified by Ken Walker as Cadmus (Brachycaulus) spp. I wonder if they are a pair, because the antennae on the smaller beetle is so much longer and I would assume therefore that it would be a male and the larger beetle a female.
Because I thought this larvae looked 'different' I kept one and will put other observations on Natureshare of the resultant beetle, which has been thought by Martin Lagerwey to be Paropsisterna brunnea.
These eggs were identified by Ken Walker as being those of Tettigoniidae spp. I did bring them inside a day or so after these photos were taken, but the only thing that hatched out of them then were two tiny wasps. I think that some had already hatched when I brought the leaf inside.