Smithsonian Report. 1928. — Aliard 



Plate 1 



1. Cicada, Tibicen lyricen, Male 



About natural size. The so-called harvest fly. Its "song " is a loud ringing z-ing-ing-ing produced 

 within specialized body cavities by the vibrations of very thin, chitinous plates. (By permis- 

 sion of Country Gentleman. Photograph by H. A. Aliard) 



2. The 17-year Cicada, Tibicen septendecim 



About natural size. At left empty pupal shell; at top emerging adult which has died in birth; 

 adult drying and gaining strength. When these interesting cicadas appear at their appointed 

 time, the mid June days are filled with their low murmurous sounds. (Photograph by 

 U. A. Aliard) 



