8 
Psyche 
[March 
Oehmichen, E. 1920. Nos maitres les oiseaux. Etude sur le vol 
animal. Paris, Dunod, 1920. 
Pettigrew, J. B. 1868. On the mechanical appliances by which flight 
is attained in the animal kingdom. Trans. Linn. Soc. London, 
26: 197. 
Prochnow, O. 1924. Mechanik des Insektenfluges. In Schroder, Chr., 
Handbuch der Entomologie Bd. I, Jena, 1928. 
Snodgrass, R. E. 1935. Principles of Insect Morphology. New York, 
1935. 
Stellwaag, F. 1916. Wie steuern die Insekten wahrend des Fluges? 
Biol. Zbl. 36: 30. 
Weber, H. 1933. Lehrbuch der Entomologie. Jena, 1933. 
Wheatstone, Sir Charles. 1827. Description of the Kaleidophone, etc. 
Quart. J. Sci. Lit. Art. 1: 21. 
