Insect and Spider Identification: Bug invading my backyard and coming into my house!, 1 by Ursab

Ursab wrote:
I went outside yesterday to find these bugs all over the concrete slab steps leading out from my sliding door to my garden! There were hundreds of them, and a lot of them were already dead (I sprayed them away with water). Sorry for the poor photo, my camera is old and it was dark outside. Unfortunately, a number of them made it into my house and I'm sure more will follow (I haven't figured out how they are getting in yet).

I go to my garden everyday so I was surprised to see so many of them come out of nowhere. I even found them on the outside part of the window sills! Anyone know what they are and how to get rid of them?