TRANS. N.ZINSTITUTE,VOL?^Pl.IM. 



;. J.a^. ffALLUS PECTO/?AUS Jj&ss. Froi7v lyp& sp. iro ^uUe^rs coUejcUoTb CM. 

 Z. Z.ou. RALLUS PICTUS. 



J:B. del. &> l&h. 



,(lr 



Transverse section of the abdomen of the female 

 Cicada, showing the rudimentary drums {d/r) . 



dy 



.SC 



Transverse section of the abdomen of the male Cicada, showing anterior view of the muscles for vibrating 

 the stridulating membrane : (a) muscle ; (6) tendon inserted into (c), the under surface of the 

 stridulating membrane ; {d) the drums. 



Under view of the abdomen, showing the scales covering the openings into the drum-cavities (»c). 

 Ditto, the scales removed, showing the drum-cavities {dr). 



4. Upper surface of the stridulating membranes (str) . 



Ijl.FofwaU deZ. JB. li^Ju 



