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"Ontario is home to a diversity of small to very small, generally dark-coloured, lady beetles in the subfamily Scymninae. The most commonly noticed member of this group is Brachiacantha ursina, a small (3-4mm) black beetle with orange spots. Larvae of the large genus Brachiacantha are rarely seen because, unlike the familiar larvae of the common red lady beetles, they stay underground. We really don't know much about what these little beetles eat, but at least some larvae in the genus are found in ant nests where they eat scale insects. Many, but not all, of the black lady beetles eat scale insects and mealybugs, unlike the more familiar, aphid eating, red lady beetles."
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