I found these in a local park, on the trunks of sycamore trees, as well as a nearby fence. They are the size and shape of ladybug larvae, but with unfamiliar coloring/markings. There were also several larvae of the Asian ladybugs in the same area. Because of their size, and the fact that they were on surfaces that did not contain apparent food sources, I am guessing that they were mature larvae looking for a place to pupate. In fact I found one that had just split its skin.