PROCEEDINGS OF THE 



ENTOMOLOGICAL SOCIETY OF WASHINGTON 



VOL. 22 



DECEMBER 1920 



No. 9 



NOTES ON THE PERIODICAL CICADA IN 1919. 



BY RAYMOND A. ST. GEORGE, Bureau of Entomology. 



Introduction. 



The following events on the 1919 emergence of Brood X, of the 

 Periodical cicada (Tibiccn scptendecim Linn.) were taken about 

 Falls Church, Va., and vicinity. 



Calendar of Events. 



DATE. CICADA EVENT. 



April 24 Exit holes numerous in certain areas: nymphs in them six to 



eight inches from the surface; a few chimneys under logs. 

 May 14 First cast skin of season reported from Black Pond, Fairfax 



Co., Va., by Dr. A. C. Baker. 

 May 18 First adult at Falls Church, Va. 



May 21 Approximately forty adults and skins on a dogwood tree. 



May 22 First appearance of adults in numbers. First note of the cicada 



song heard on Minor's Hill. 



May 23 Notes and song of adult more distinct. 



May 24 Beginning of maximum emergence of nymphs at dusk. 



May 25 Maximum volume of song. Continuous for first time all day. 



Nymphs emerged regularly at dusk by hundreds. 

 May 26-29 Nymphs emerged regularly at dusk by hundreds. 

 May 30 End of maximum emergence of nymphs; emerged about the 



same time at dusk from May 24-30th, incl. 

 May 31 Adults copulating and ovipositing.- 



June 1 Many adults dying from well known fungus diseasi-. 



June 4 Large species (T. sept.) and small variety (T. sept. var. nisxinii 



Fisher) both singing. 

 June ") Copulation period nearly over. Last day of maximum volume 



of song. First signs of cicada injury; leaves turning brown, 



twigs broken. 

 June 12 End of oviposition period. (Note by Dr. T. E- Snyder.) 



Adults beginning to disappear. 



June 1 .") Concert only during hottest part of day. 



June 17 Results of cicada injury very noticeable. 



June 20 Adults nearly all gone. Dr. T. E. Snyder.) 



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