I was moving some flag stones in my yard today to prepare a garden bed, and when I flipped over one of the stones, I found a colony of C. castaneus underneath. Luckily I had a large Ziploc bag with me at the time and a hand shovel, and I basically scooped the colony into the Ziploc bag. The queen was right under the stone, and I took her, about 35 workers, and most of the larvae that I saw. I am trying to approximate about how old this colony is, and I am afraid that I may have taken the queen of an old established colony. What puzzles me though is why the queen was so close to the surface. I thought maybe the larvae could tell me the age of the colony. As you can see, the larvae that I snagged are very large, and in fact, these were pretty much all of the larvae I saw (I took all of them). Do these larvae look like major larvae or queen larvae? In my experience with the C. castaneus colonies, they started producing majors in their second year. At first I thought that the colony I caught was in their second year because most of the workers were minors and there were only two majors and one submajor. Then, I began doubting that maybe there were more workers deeper in the nest. In the first photo you can see a submajor tending to the larvae. In the second, you can see the queen and a major worker by the entrance of the test tube. Notice how the larvae are almost as big as the queen!