CH. V] 



WASPS 



133 



thereby produced. It is noteworthy that the sound can 

 be produced by the insect when the wing has been 

 reduced by amputation to a mere stump. As more and 



Fig. 23. 



Eight half of thorax of Anopheles maculipennis y Meig., with base of 

 right wing and right halter. Magnified about 45. 



The same magnified about 7 to show the area which bears the 

 stridulator. This area is shaded. 



Toothed bar. A 1 . The teeth which rasp on the ridges borne by B. 

 B. Blade bearing the ridges jR. C. Trough which limits the 

 movements of B. K. Distal end of halter. The remaining 

 letters refer to details not mentioned in the text. 



[From A. E. Shipley and E. Wilson.] 



