Ventral view of the head. The black structure running down the center is the "beak" nested in its groove.

139 shots in Zerene Stacker. Swift 4X 0.10 160/.17
These were first sighted across the mountain from my Bethlehem home in Allentown, PA in 1998. They are believed to have come in on a shipment from Asia. Right now in our area they are pervasive and now that it's getting cold, they do everything they can to invade our houses for warmth. Late in the day you might see 10 to 20 of them on sunward facing window screens.
For more grisly details, go to http://en.wikipedia.org/wiki/Brown_marmorated_stink_bug
And, yes, they do stink when they are alarmed. Fortunately, they are slow moving and can be grabbed with tweezers and flushed down the toilet.