<i>Polistes instabilis</i> (IMAGE) University of Washington Caption Wasps in the species Polistes instabilis form small, simple colonies of a few dozen adults. The open cells of the nest contain the young brood, mostly larvae. The white-capped nest cells contain pupae inside silken cocoons, and adult wasps will emerge from these. This nest was in a tropical dry forest in Guanacaste, Costa Rica. Credit Sean O’Donnell, University of Washington. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.