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Brochymena affinis
Black with red markings
Spotted on a garage door
Hi Noel (and Paul), I think this looks a bit different than a Brown Marmorated Stink Bug.
To me, this looks more like a Rough Stink Bug nymph, Genus Brochymena. Brochymena affinis is very likely but I think there is at least one other species from this genus in your area (not sure which one at this time,sorry!). Take a look here:
http://bugguide.net/node/view/234688
Here are a few images of Halymorpha halys nymphs, note the light banding on the antennae and the shape of the protonum (area behind the head). It is quite different in shape:
http://bugguide.net/node/view/706175
http://bugguide.net/node/view/453961
General info on Halymorpha halys: http://bugguide.net/node/view/9806