EXPERIMENT STATION RErORT. 



559 



THE PERIODICAL CICADA. 

 Tibloen septendeoim. 



Just seventeen years ago I wrote in my first Report as Ento- 

 i-nologist to the Experiment Station: "There will be many who 

 contend that the insect appears every few years and that the seven- 

 teen-year period is only imaginary, while others who have obsei-ved 

 them in one locality only v/ill ridicule the assertion that they are 

 met with in any years but those shown on their own records." At 

 that time also I listed the broods knowai to occur in New Jersey 

 iind i>-a\'e their distriljutiou as shown from the records. 



Tlie Periodical Cicada : 



Fig. 18. 



pnpa ready to change ; It, empty pupal shell ; c, adult ; (/, cavities 

 to receive eggs ; e, eggs, enlarged. 



Every brood then listed has appeared on schedule time, and in 

 Tiiy Reports for 1894, ISOS and 1902 will be found accounts of the 

 broods occurring in those years. Since 1889 our knowledge of this 

 insect has increased so tliat instead of twenty-two broods known at 

 that time we now record thirty, as w^orked out by Mr. Marlatt in 

 circular 45, second series of the Entomological Division, United 

 ^States Department of Agriculture. 



