BY R. VON LENDENFELD, PH.D. 987 



When at rest the wings of Diptera are more or less askew. "When 

 a fly is immersed in turpentine it is immediately made insensible 

 and lies motionless. Tetanic movements, after a short time, cause 

 .slight movements of the legs and then the wings, although 

 remaining in the same position relative to the body, turn their 

 face round in such a manner that they firstly become quite flat and 

 then askew in the opposite direction to the original position. 

 This movement is slow and can easily be observed. When the fly 

 is dead the wings collapse again and return to their ordinary 

 shape. 



The same movement for which a mechanical action of che 

 resistance of the air is considered the sole cause, is here executed 

 in a manner which precludes the possibility of such a cause. 



I think this proves my views in an ecpaally simple and decisive 

 manner. 



In connection with this I would like to draw the attention of 

 the reader to peculiar effect of the " insecticide " on the large 

 vi viperous flies. They invariably give birth to the maggots when 

 under the influence of it at a time when the tetanus appears in 

 other parts of the body. The maggots are not influenced by the 

 insecticide to any great extent. 



