Aphid

SEM image

Aphids (superfamily Aphidoidea, genus Aphis) are small plant-sucking insects. Their predators are ladybirds.

Some species of ants "farm" aphids, supplying them with leaves to eat, and eating the honeydew that the aphids secrete.

P-14 lady beetle consuming an aphid

More photos of (beneficial insect)ladybugs eating aphids can be seen at: http://www.pollinator.com/gallery/June/ladybug.htm