2nd instar. A very active little critter... I was lucky to get a clear shot, it stood still for only a couple seconds.

To me, those mouthparts under the mandibles look abnormally large, but maybe I'm projecting adult characters onto it.

I've put both mealworm larvae and drosophila pupae in the container, which I assume it ate before molting. I've yet to observe it feeding, though. This is the only individual that has survived, out of three I originally found.