— 9i — 



The Influence of Climate on Cicada septendecim. 

 By C V. Riley. 



I have instituted the present season a series of experiments in the 

 transferring of the eggs of Brood XXII {septendecim) of the Periodical 

 Cicada, to the extreme southern states, where no septendecim brood is 

 known to occur and of Brood VII [tredecim) to northern states where no 

 tredecim brood is known to occur. The purpose of the experiments is to 

 test the effect of climate on the permanency of the two races; in other 

 words, whether the larva in its subterranean life will be influenced by 

 variation in the mean annual temperature. It will be interesting to ob- 

 serve whether or not the tredecim race will require more than 13 years 

 for development when transferred north, or the septendecim race fewer 

 than 1 7 years when transferred to the south . 



The details of the experiments will be placed on record. The 

 following transfers have already been made through the kind assistance 

 of the gentlemen mentioned: 



BROOD VII {Tredecim). 



EGGS RECEIVED FROM. 



EGGS SENT TO. 



July i, 1885 

 " 6, 1885 

 " 13, 1885 

 " 13, 1885 

 " 13. 1885 



P. H. Skipwith, Oxford, Miss. 

 W. L. Peters, Senatobia, Miss. 

 J. G. Barlow, Cadet, Mo. 

 P. H. Skipwith, Oxford, Miss. 

 P. H. Skipwith, Oxford, Miss. 



J. A. Lintner, Albany, N.Y. 

 J. H. Comstock, Ithaca, N.Y. 

 Herbert Osborn, Ames, la. 

 Saml. Henshaw, Boston, Mass. 

 R. Thaxter, Kittery Pt, Me. 



BROOD XXII (Septendecim). 



The Periodical Cicada on Staten Island. 

 By William T. Davis. 



In 1877 the Periodical Cicada occurred on Staten Island in count- 

 less numbers. In places fences, trees and bushes were brown with 

 cast skins, while the whir of their flight and monotonous song could be 

 heard in every direction. This was the Hudson River brood, or that 



