Check out the links. Looks like yours Paul, are Large Milkweed bug nymphs but it doesn't hurt to compare.
http://en.wikipedia.org/wiki/L...
http://yardfarmaustin.com/leaf...
I had these on my blueberries last year & the nymphs are soft bodied so I used some Murphy's Oil soap with a drop of dishwashing liquid & some alcohol in a spray bottle, fill it up with water, shake & spray on the creatures. You will have to rinse it off before the sun fries the leaves so choose your time of day to spray.
http://bugguide.net/node/view/...
