SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



PLATE 16 



Figs. 42-45. Flight-curve obtained by the flight-kymograph. The fly was 

 held horizontally with the anterior end opposite to the direction of the move- 

 ment of the board. (Natural size.) Figs. 42-44 are consecutive parts of a 

 continuous curve. 



