i live in n cal. have a beetle(well a lot of)these are aboutquarter inch long and black with red spot.Q bad or benificial
You don't mention the shape of the beetle. There are ladybugs which are perfectly round, which are black with 1 or 2 red spots roughly in the center of their back. They are about 1/4 inch long.
You can go to bugguide.net and search for "ladybug" and you will find more colors than just red with black spots. Some are yellow orange, some orange, some red-orange, and some are black with red spots.