Spotted in different environments: Dark corners of finished cellar, kitchen counters, office buildings near windows. Found eating scattered dry cat food. I think the larvae are dark, maggot-like, fast moving, often in "gangs," and they hide from light. They also eat cat food. The beetles seem to be able to fly, but don't do so willingly. Easy to catch when you see them. I don't recall that they ar emore prevalent in one season or another, except that when spotted outside, it was in warmer weather.