Bean aphid

The two most common species encountered on beans are the cowpea aphid and the bean aphid. The cowpea aphid, which is also common on black-eye beans (cowpeas), is shiny black with legs and antennae that are white to pale yellow with black tips. The bean aphid is slightly larger than the cowpea aphid, and dark olive-green to black with light-colored legs. The pea aphid is a relatively large, green, somewhat shiny aphid.