Harper's New Monthly Magazine Volume 109 June to November 1904 . hat a brood had appeared in ing note is popularly held to predict hot 1868; and the only ability, that of add- weather, and which in form and habit re- ing seventeen to these figures. In like sembles the seventeen-year species. Since manner, by adding seventeen again, a this insect is known to 1902 brood was pre- appear from year to > dieted, and it arrived year, some persons havedoubted the existence ofa seventeen-year specieson the ground of whatthey call their own ob-servation. But Septen-decim is truly period-ical, and tak
Harper's New Monthly Magazine Volume 109 June to November 1904 . hat a brood had appeared in ing note is popularly held to predict hot 1868; and the only ability, that of add- weather, and which in form and habit re- ing seventeen to these figures. In like sembles the seventeen-year species. Since manner, by adding seventeen again, a this insect is known to 1902 brood was pre- appear from year to > dieted, and it arrived year, some persons havedoubted the existence ofa seventeen-year specieson the ground of whatthey call their own ob-servation. But Septen-decim is truly period-ical, and takes seven-teen years to time is spent un-derneath the ground, inan undeveloped condi-tion known as the pupastate. The shells arethe cast-off pupa-cases,or final moults, of theinsects when they comeup after their long so-journ within the earth. At several points inthe United States seven-teen - year cicadas ap-peared in the spring of1902, while in otherparts there were uncovers one ofthe curious facts inthe insects naturalhistory. Somewhere. We begin our historywith the exode of thepupae from the ground,and will limit it to ob-servations (hitherto un-published) of the broodof 1885 in first pupae appearedabout May 23, but werenot out in great num-bers until the secondweek in June. Theexode began about sixoclock, evening, andcontinued during thenight, but chiefly thefirst part thereof. Theexit from the burrowwas deliberate, as wasalso the insects prog-ress over the surfaces on time. If readerswill make note of thecicadas coming in theirown neighborhood, theymay be sure that seven-teen years thereafter an-other brood will appear. The Seventeen-year Cicada andits Pupa-case THE STRANGE CYCLE OF THE CICADA. 45 r. Cicada 2. Grasshopper and young on which they moved forward andupward without manifestdirecting purpose, but witha general tendency to getas far up as paused at variousdistances from the ground,and attached th
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