l.N.JL'iaOL'S AND J3ENEFICiAL JNSiOC'J'.S. 2.;5 



ceedingly gratifying to find, fou)- months riftor T liud pulj- 

 lishcd tluB fact, that the samc! discovery lj;id h* *;)j niJido years 

 before by Dr. SmitJi, t,lif;iigli it had never been given to the 

 world." 



Mr. Riley predicts that in southern New England a l^iool 

 will appear in 1877 and 1885. Probably the Plymouth brood 

 which appeared in 1872, will not appear again for seventeen 

 years, namely, in 1889, the two broods noticed by Hi ley ap- 

 pearing west of this town. As regards its appearance in 

 Plymouth, in this State, Harris states that it appeared there in 

 1633. The next date given is 1804, "huf, if the exact period 

 of seventeen years had been observed, they .should hfive re- 

 tumcd in 180.^5." 



Mr. li. M. Watson infoiTns me from his personal observa- 

 tion, that it also appeared in 18.38, IHoiJ and 1872. Tn Sand- 

 wich it appeared in 1787, 1804 and 1821. In Fall Kiver 

 it appeared in 1834; in Hadley in 1818; in Bristol County 

 in 1784, so that as remarked by Harris and others it appears 

 at different years in places not far from each other. So that 

 while in Plymouth and Sandwich we may look for its re-af>- 

 pearance in 1889, in Fall River it will come in ]^Ai), or four 

 years earlier. 



There are 

 three species of 

 cicada in this 

 State, and in 

 order that they 

 may not b e 

 confounded in 

 studying the 

 times of ap- 

 pearance of 

 the different 

 broods of the 

 seventeen-year 

 species I add a 



short deSCrip- pig. 7.— The Seventeeu-year Cicada, and Popa. 



tion of each form, so that they may be readily recognized in 

 the winged and immature states. 



The two largest species are the seventeen -year locust 



