248 
Psyche 
[September 
and to Mr. J. M. Reichson and Mr. W. B. Kerfoot for their help 
and advice rendered during the present study. This work was sup- 
ported by grants from the Swiss National Science Foundation 
(Fellowship 1967), Stiftung fur biologisch-medizinische Stipendien 
(Fellowship 1968) and U.S. National Science Foundation (Grant 
No. GB 5079, E. O. Wilson, Sponsor). 
References 
Brun, R. 
1914. Die Raumorientierung der Ameisen, Gustav Fischer, Jena. 
Creighton, W. S. 
1950. The Ants of North America, Bull. Mus. comp. Zool. Harv., 104. 
Erlandson, R. A. 
1964. A new Maraglas D.E.R. 732 embedment for electronic microscopy , 
J. Cell Biol. 22: 704. 
Fletcher, D. J. C. and Brand, J. M. 
1968. Source of the trail pheromone and method of trail laying in the 
ant Crematogaster peringueyi, J. Insect Physiol. 14: 783-788. 
Gabba, A. 
1967. As petti delV organizzazione negli insetti sociali. 2. La sostanza 
della traccia nei Formicidae, Natura, Milano, 58: 150-172. 
Goetsch, W. 
1934. Untersuchungen ueber die Zusammenarbeit im Ameisenstaat, Z. 
Morph. Okol. Tiere, 28: 319-401. 
Romeis, B. 
1948. M ikroskopische Technik, Leibniz, Miinchen. 
Wilson, E. O. 
1963. The social biology of ants, A. Rev. Ent. 8 : 345-368. 
