I don't know why there has been an annual fall explosion/migration of Ladybugs into our homes the past 5 or 6 years but I have my theories.
1) These are the progeny of the all the ladybugs sold by sustainable gardening companies
2) These are the ladybugs attracted to the soybean fields infested with aphids. They come in and eat the aphids all summer, lay eggs, eggs hatch, larvae eat aphids until they get big enough to pupate into adults in late summer/early fall. The fields are harvested in October displacing the lady bugs and they come to our homes because they look like white cliffs to the insects
3) The environment is out o' balance and this is one result (others include a series of catagory 5 hurricanes in the Carribbean and Gulf of Mexico in 2005, melting icecaps, etc..)
What ever the causes they are migrating into our new to us (but around 100 years old) house while it is being painted and caulked.
I wonder how many have wondered into the walls and will find themselves trapped