46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 144 



Reed, S. C. ; Williams, C. M. ; and Chadwick, L. E. 



1942. Frequency of wing-beat as a character for separating species races of 

 geographic varieties of Drosophila. Genetics, vol. 27, No. 3, pp. 

 349-361. 



Savile, D. B. O. 



1950. The flight mechanism of swifts and hummingbirds. Auk, vol. 67, pp. 

 499-504. 



SOTAVALTA, OlAVI. 



1947. The flight-tone (wing-stroke frequency) of insects. Acta Entomo- 

 logica Fennica, pt. 4, 117 pp., 18 illus. 



1952. The essential factor regulating the wing-stroke of insects in wing 

 mutilation and loading experiments and in experiments at sub- 

 atmospheric pressure. Ann. Zool. Soc. "Vanamo," vol. 15, No. 2, 

 66 pp., 12 figs. 



1954. The effect of wing inertia on the wing-stroke frequency of moths, 

 dragonflies and cockroach. Ann. Ent. Fennica, vol. 20, No. 3, pp. 93- 

 101. 

 Stresemann, E., and Zimmer, K. 



1932. Ueber die Frequenz des Fliigelschlages beim Schwirrflug der Kolibris. 

 Orn. Monatsb., Jahrg. 40, No. 5, pp. 129-133. 



Note: After completion of the present manuscript I have noted Frank A. 

 Hartman's "Locomotor Mechanisms of Birds" (Smithsonian Misc. Coll., vol. 143, 

 No. 1). This paper contains many data on dimensional relationships for birds. A 

 cursory inspection of the tables indicates general agreement with the relationships 

 presented here. It is unfortunate that I was unable to include Hartman's excellent 

 and abundant data in the present compilation. — C. H. G. 



