Family Chrysomelidae
These are medium-size bettles and very commonly seen in the summertime. As their name suggests, they feed on Milkweed plants (Asclepias fructicosa)They are found in the eastern and northern areas and easily identified by their metalic colours.
Identification by Riaan Stals http://www.ispot.org.za/node/158697?nav=latest_obs_thumbnail_grid