The bigger aphid that is being eaten looks like it could be Uroleucon. On the smaller ones I just can't see the identifying characters, but they are definitely a different genus. If you knew what type of plant this was it might help, but it might not. Aphids usually need to be chemically cleared and slide mounted to give a definitive ID, because I usually have to look at things like the number and arrangement of sensory organs on the antennae, wing venation, shape of the cauda (tail) and how many hairs it has, hairs on other parts of the body, etc. etc. Even with a slide mounted specimen ID can still be tough or impossible. Aphids are fun.