The type I have don't fly but I have seen that before in Texas. Roaches are gross enough but flying roaches are stuff nightmares are made of. In Texas I had some hit me in the face when I was sitting down. They are so big that they knock on your door and ask to come in your house!
I have heard of diatomaceous earth and looked for it before but at the time couldn't find it. But boric acid also works by dehydrating. In the big picture boric acid is not very toxic to humans. You would have to ingest a lot to cause a problem. When I clean it up I will wear a mask to limit exposure though. I will keep my eye out for diatomaceous earth again.
DE is used in pool filters, check your local pool supply.



