REPORT OP THE ENTOMOLOGIST. 



255 



In 1881 "vre made some attempt by sending eggs of tlie iredecim brood 

 XVIII, obtained in 3Iissouri, to afew of our Northern correspondents, but 

 with oue exception the experiments were not made with sufiicient care. 

 Mr. B. Pickman Mann, then living at Cambridge, Mass., phiced in our 

 hands a record of some twigs which were sent to him. Tlie eggs seemed 

 to be shriveled up so that he feared they might be abortive. But he 

 ]>hiced some of them (four twigs) under a large apple tree behind his 

 liouse, No. 10 Follen street; twelve sticks under a large oak tree aboni 

 thirty i)aces directly south of the middle of an open space amid large 

 pine trees on the path from Prof. C. E. ^STorton's house toward the 'Slw 

 seum of Comparative Zoology; eight sticks under another large oak tree 

 about seventeen paces east-southea.st of the last, and live sticks under 

 two hirger oak trees about twenty-five paces directly east of the western 

 corner of Norton's woods. 



The present year we have instituted a series of experiments which 

 promise tangible results, as we have taken precautions not only to see 

 whether the eggs really hatched at the different localities where they 

 were placed, but to have the exjieriments recorded. We also place the 

 details of these experiments on record in this report, and it will be very 

 interesting in the future to observe whether or not the iredecim race 

 will require more than thirteen years for development at the Zsortheru 

 points, or the septendecim race fewer than seventeen years at the South- 

 ern points. We would therefore ask all those who may read this arti- 

 cle and feel sufficient interest in the matter, and who may be living at 

 the time, to look for the appearance of Cicada at the points indicated 

 during the closing years of the present centurj' and the first two years 

 of the next, and to send to the Department the results of observations. 

 The following transfers were made with the kind assistance of the gen- 

 tlemen mentioned : 



Bkood VII {Iredecim). 



