well I saw what I thought was a honey bee hauling a piece of leaf into a hole in the lock of a patio door (we don't close it ..in the summer..it closes off part of our back porch..)....well we watched and it brought more and more leaf pieces..so I took a photo of it and then downloaded it and looked them up on the computer..
leafcutter bees.
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http://www.ext.colostate.edu/pubs/insect/05576.html here is a link to the site where I looked them up.
well they are harmless and the door isn't needed..we will let them safely next inside the door..and then in the spring they can hatch out and go where they please..happily pollinating our plants..will have to warn people about them..as they aren't dangerous..but look "beeish"..some people around here are afraid of bees..not me.