1 8 Bulletin American Museum of Natural History. [Vol. XXIL] 



Fig. 2. — Similar tent, natural size. From a photograph made by Professor 



Comstock. 

 Fig. 3. — Piece of black carton built over twigs under a stone by a Colorado 



variety of Cremastogaster lineolata. | natural size. 

 Fig. 4. — Surface chambers of nest of Cremastogaster lineolata under a large 



stone, showing black carton covering rootlets. \ natural size. 



PLATE V. 



Nest of a Colorado variety of Cremastogaster lineolata built of dead oak-leaves 

 and black carton under a stone. | natural size. 



PLATE VI. 



Fig. I. — Membracid-tent of Formica rufa integra Nyl. built about the roots 



of a young birch {Betula populifolia) . ^ natural size. 

 Fig. 2. — Similar tent built around a bird's nest. 5 natural size. 



