REPOP.T OF THE ENTOMOLOGIST. 253 



pear iu subsequent years. It is gratifying, after the lapse of seventeen 

 years, to lind that twenty of the twenty-two broods thus tentatively 

 given hy us have since been fully established by records. Brood III, 

 as shown by Bulletin 8, is evidently invalid, and we have stricken it 

 out, while Brood X needs further confirmation of its validity; yet we 

 have deemed it best to retain the numbering of 18GS, as that enumera- 

 tion marked an epoch in our exact knowledge of the various broods. 



The foUowiug summaries may be made for convenience; the Eoman 

 numerals indicating the number of the brood and the asterisk the 13-year 

 broods. 



During the next seventeen years there will occur broods of the Peri- 

 odical Cicada somewhere or other in the United States, in the following 

 years: 



Thus every year except 1887, 1890, and 1892, will, during the next 

 seventeen years, be somewhere a Cicada year ; and it wiU be noticed 

 as there are thirteen septendecim and but eight tredecim broods, it fol- 

 lows that when one of these last ai)pear it wiU nearly always be in 

 connection with one of the former. 



It further appears that the number of distinct broods appearing in 

 different years within the same geographical limits are aa. follows : 



Alahama.—Foiir broods; years 1893 [XVI*J, 1894 [XVIII*], 189C 

 [IV*], and 1902 [XXII or Vn*?]. 



Arkansas.— Four broods ; years 1891 [IX], 1894 [XVIII*], 1896 [XIVl, 

 and 1898 [VII*]. 



Colorado. — One brood ; year 1891 [iX], and possibly another in 1893 

 [XI]. 



Connecticut— Two broods ; years 1886 [I] and 1894 [XII]. 



Delaicare.— Two broods; years 1889 [Vin] and 1902 [XXII]. 



Districtof Golumhia.— Two hvoods ; years 1894 [XII] and 1902 [XXII]. 



Florida.— One brood ; year 1896 [IV*]. 



Georoia.—FiYe broods ; vears 1893 FXVI*], 1894 [XVni*], 1895 [II*], 

 1898 [VIP], and 1902 [XXH]. 



IlUnois.-Se\en broods; years 1888 [V], 1889 [VIII], 1893 [XI], 1801 

 [XVIII*], 1895 [XIII], 1898 [VIP], and 1002 XXII]. 



and 1896 [XIV]. 

 1893 [XI J, 1894 



Indian Territory. — Two broods ; years 1894 [XVIII 



India7ia.—Fiye broods ; vears 1888 [ V], 1889 [VIII 

 [XII], and 1902 [XXII]. 



Iowa.— Three broods; years 1888 [V], 1895 [XIII], and 1896 [XIVj. 



Kansas.— Two broods ; years 1893 [XI] and 1896 [XIVj. 



Kent7ichj.— Five broods ; vears 1889 [VIII], 1894 [XVIII*], 1897 [XV], 

 1S98 [VIP], and 1902 [,XXII], and possibly a sixth in 1893 [XI]. 



