Smiley-face Wasp and a PS

Photo by Lloyd Spitalnik
Shakespeare Garden, September, 2006
http://www.lloydspitalnikphotos.com

It has another name, but if you look at the wasp's thorax you'll immediately see why we call it what we do.

PS As for the other name, Lloyd adds: We're pretty sure it's Ancistrocerus adiabatus