I believe I just destroyed one of these this morning - it was feeding on a rose bud. I think it's the dreaded Japanese beetle. Mine was like a shiny dull green metallic colour and looks like your picture. I hope someone tells us different.
How large are these insects? What type of leaf is that? I'm having a tough time figuring out the overall scale of the critters. BTW, Zany's fortunate to live out west like she does - they don't have Japanese beetles out there. But, then again, we don't have scorpions in Ohio, either! LOL
These range in size from about the size of a lady bug to the size of an ant. They are sitting on the leaf of an Agapanthus plant. They do not have any wings that I can discern and the shiny black in the picture is pretty much what my naked eye sees. The leaf they are on is yellowing but I do not know if these bugs are the cause or if it is simply dying naturally as it is an older leaf. I looked at them again this am and noticed there are several tiny ones in the group that are bright shiny red while the rest are black.
I thought about ticks but all the ticks I have seen were brown.
As for the Scorpions...I live on the north coast and we don't have them here. They stay with the rattle snakes in the mountains higher up from us and in the deserts. :)