76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



PLATE T9 



Fig. 53. Series of instantaneous photographs of a flying Calliphora 

 vomitoria. Direct sunlight. Time of exposure for each individual image 

 1/42,000 of a second. Interval between successive images 1/2,150 of a second. 

 The arrows show the succession of time : the upper row running from right to 

 left, the lower row from left to right. 



Upper row (the fly seen from behind). 

 a, Lowest position of wings. 



ab, Raising of the wings (the wing cross-sections are steep). 

 h. Highest position of wings. 



be, Depression of wings (the wing cross-sections are at first horizontal and 

 then inclined). 



c, Lowest position of wings. 



Lower row (the fly seen from above). 



d, Highest position of wings. 



de, Depression of wings (the wing cross-sections are at first horizontal and 

 then inclined). 



e, Lowest position of wings. 



ef, Raising of the wings (the wing cross-sections are steeply inclined, steepest 



in the middle of this phase of the movement). 

 /, Highest position of wings. 



