1931 ] Nest-Building Habits of Polistes rubiginosus 143 
combs. They make all of the combs in one season, instead 
of building a new comb each year. However, Vespa 
Figs. 2=5. For explanation see text. 
crabro 10 builds comb below comb in hollow trees, without 
paper covering-sheets, and builds the combs all in one 
10 Buetenmuller. Trans. New York Entom. Soc. 6, plate 9, 1911. 
