Nest building at the end of winter in Pobstes hebroeus, is dependent on the suitability of the site and its height from the ground level. Healthy wood fibres are used as material for the construction of cells which is done in instalments. No two queens will ever agree to work together with the result that some nests, at the very inception meet their ill fate. The largest nest is 2ft. 7½ ins. in circumference with 1456 cells. Imagines only hibernate. Unemerged individuals die during autumn disaster. Preimaginal stages are differentiable on structural characters. Prepupa is not divisible into two substages