Absolutely fascinated with these tiny, (body about 1 cm long) noisy creatures. They look harmless but I understand they bite. That blossom is from a small semperflorens begonia (otherwise known as "wax begonia).
Just came across this picture I took three years ago - completely forgot that I'd ever seen these insects before! This older picture was taken with a Canon 7D and Canon 60mm macro lens. Don't let the displayed EXIF for the picture above mislead you.