Agree, should be Dictyophorus spumans, nymph.
http://www.flickr.com/photos/40325561@N04/5642100682
If this is not our very own and famous Dez??
https://www.facebook.com/photo.php?fbid=485681734860866&set=a.324501807645527.71786.324483287647379&type=1
http://media1.mweb.co.za/biodiversity/orthoptera/pyrgomorphidae/index.htm
http://oldsite.david-tyler.com/uploaded_images/Capetown%20Foam%20Grasshopper%20Dictopherous%20Spumans.jpg
WTB have this as Phymateus sp., I will make a comment with the link from this picture.
http://www.whatsthatbug.com/2009/01/06/immature-toxic-milkweed-grasshopper-from-south-africa/
Poisonous and they seem to come in many different colour setups. The one in the ID suggestion is quite similar to your spottingd, apart from the abdomen.
Hope this helps
Tina
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