Late November, early December we found a few of these strangers in the house. Some green/brown on the back. a few spots on the sides. Flat. Fairly hard-shelled. diamond pattern. This particular one is more brown than green (maybe from living in the house?) and apparently reads music.
I wrote to What's that Bug <http://www.whatsthatbug.com/>and here's the result: Western Conifer Seed Bug, Leptoglossus occidentalis,