Yukimushi translates to "Snow Bug or Snow fly" in Japanese. They are a type of white aphid which on close inspection are not beautiful, at all.. In fall they fly around and their white colour is a striking reminder of the coming winter.
Many people say that the first snows of winter will arrive 2 weeks after the first Yukimushi are seen. I saw some this past weekend but I don't believe it will snow for another month, at least.
Justin