We have various leafy lettuces. They look healthy and strong. They do, however, have an insect infestation on the underside of the leaves. This is not much of a problem as I brush a lot of them off when I pick the leaves, and wash most the rest off. I would rather eat a couple of bugs then pesticides. They look similar to aphids, but not as fat and juicy, and almost black in colour. They don’t seem to be doing, much damage. I am just curious about what they are. Does anyone know what it might be?