PROCEEDINGS 



STATEN ISLAND ASSOCIATION 



OF 



ARTS AND SCIENCES 



Vol. IV October iqii-May 1912 Parts I and^II 



Notes on the Seventeen- Year Cicada in 1911^ 



William T. Davis 



One of the most interesting things about the visitation of the 

 seventeen-year cicada, Cicada septendecim L., in 191 1 is that 

 apparently they did not appear quite as early as they did in 1894. 

 In that year- there was a severe storm on May 20 that killed many 

 of the cicadas that had previously appeared in great numbers. 

 This year, however, the earliest record was May 20, and they 

 were not abundant until May 23. 



As usual, the pupse were found early in the spring under logs, 

 stones, etc., and later the cones were found in woods where there 

 were leaves lying on the ground, the tops of the cones reaching 

 the level of the upper layer of leaves. The cones were always 

 found where the ground was damp in the spring, that is, covered 

 with a layer of dead leaves which retained much moisture. When 

 the ground has been burned over, consuming the leaves among 

 which they were made earlier in the season, the cones become 

 very conspicuous objects. 



^Presented October 21, 1911. 



^ Proceedings of the Natural Science Association of Staten Island, 

 4 : 33, Sept. 8, 1894. 



I 



