They are a different form of so-called Lady Bug than our original. They are Asian Beetles and were brought over here.
In an attempt to sell "natural pest control", certain
companies around the country have been importing
lady bugs from other parts of the world and selling
them. These lady bugs have been marketed as being
more aggressive and hearty than our own indigenous
species. One feature of their biology, however, is
that they do not die each winter. They hibernate.
Unlike our own native species, these imports like
to over winter on mountainsides, rocks and caves.
Such environments are readily available in certain
parts of our country, but since these lady bugs
are being released in areas where such terrain
does not exist they are taking advantage of the
next best thing - our homes!
You can check out reading here: although the videos are missing but it has a lot of information.
http://www.bugspray.com/articles98/ladybugs.html
We have had problems in our last home, our current home and our vacation home up at the lake. We have used the CYPERMETHRIN they talk about and a few other products. I don't like using the stuff but I also do love my homes and do not appreciate coming home to my house full of them. If you have an a/c unit that is not covered you are asking for it. We forgot to take ours out one year and I came home to literally thousands of them in my bedroom. I had to vacuum them up which destroyed the vacuum because these particular ladybugs have a very strong odor. Squish one and you will see.
This is a useful site which is where I found the ladybug stuff.
http://www.bugspray.com/catalog/products/page1.html
You have to keep up with or they will take over. I really wish they would think about what they are doing when they introduce something new to control something else.