Ladybugs are among the 450,000 species of beetles. They vary with size, color, number of spots, and color of the spots. Asian beetles, which are the ladybugs with no spots, are what you are probably seeing.
The spots and the color are used as a warning for predators, such as many poisonous frogs.
Motor end plates are associated with muscle contraction definitely, and I would say also <em>neuron transmitter, </em>although I'm not sure about that one.
