rain beetle

last night after dinner we started hearing occasional knocking/banging on the windows.  it happens every year when we start having wet weather.  it was raining last night and the rain beetles were out.  the females cannot fly so they wait by a burrow they have dug and send pheromone signals to the males who fly around looking for them.  once a male finds a female they mate and she lays eggs in the burrow.  if the males happen to find themselves in an area near a house they are often drawn to the light coming from the windows and make quite a racket banging their big, hard bodies into the glass (hopefully not hurting themselves in the process). 
a little while ago i was out with the ducks and as i was coming back in i saw this big guy near the greenhouse door...

rain beetle, complete with raindrops