Rob Hardy's "season of plagues" comment to my last post reminded me that a year ago I submitted to Northfield.org a photo or two of box elder bugs swarming on the south-facing face of my former house, where my ex-husband still lives. As I recall, Adam Gurno gave it the honor of grossest photo of the week. I haven't seen them quite this thick yet this year, but they are plentiful and rather annoying as they look for suitable hibernation spots. They prefer light-colored, south-facing surfaces -- hence their particular profusion at this location. Here is a page with more information about them and advice on how to keep them out of your home.