Only a month ago, pollinators were abundant in my garden in Tippecanoe County, Indiana. Now, many of the flowers have quit blooming and many of the pollinators are no longer visiting. The current crop of pollinators are primarily blowflies, honey bees and cabbage white butterflies visiting the butterfly bush and alyssum. Along with most of the bees, the hover flies (which are bee mimics) have entered their winter diapause.
Hover flies feed on small bodied insects such as aphids. Many of the aphids have flown off to their winter hosts and are no longer to be found. Lacking food, anticipating winter, hover flies larvae that dropped to the ground and developed into pupa will remain in diapause until next spring.