SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



PLATE 17 



Figs. 46-49. Flight-curves obtained by the flight-kymograph. The fly was 

 held horizontally with the anterior end in the same direction as the direction 

 of the movement of the board. (Natural size.) Figs. 46-48 are consecutive 

 parts of a continuous curve. 



