Plate II 



_>il 



4?' ^ 



6 



Fig. 3. Nests of S. caementarium or C. caendeum, with decorations of 



mud pellets. Natural size. 

 Fig. 4. One-celled nest of mud-dauber. Natural size. 

 Fig. 5. Pipe-organ nest of T. albitarsis. Reduced. 

 Fig. 6. A common form of nest of S. caementarium or C. caendeum. 



Natural size. 



