CON T E N T S 
Page. 
Summary of the habits and characteristics of the Cicada 9 
The races, broods, and varieties of the Cicada 12 
A seventeen-year and a thirteen-year race 12 
Relation of climate to the races 16 
The dwarf periodical Cicada IT 
The broods of the periodical Cicada 1* 
The origin of the broods l v 
The classification of the broods 20 
The broods appearing in 1898 22 
Future appearances 23 
The distribution of the periodical Cicada 23 
Sources of information 23 
The general range of the species and of the two races 25 
The relationship of the different broods 27 
The range of the well-established broods, taken in the order of future 
appearances 29 
Brood XVII — Septendecim—1898 30 
Brood VII— Tredecim— 1898 30 
Brood XIX— Septendecim— 1899 31 
Brood XX— Septendecim— 1900 32 
Brood XXI— Septendecim— 1901 33 
Brood X— Tredecim— 1901 34 
Brood XXII— Septendecim— 1902 34 
Brood I— Septendecim— 1903 37 
Brood V — Septendecim — 1905 ;!T 
Brood VIII— Septendecim— 1906 
Brood XVI— Tredecim— 1906 L0 
Brood XVIII— Tredecim— 1907 10 
Brood IX— Septendecim— 190S 42 
Brood II— Tredecim— 1908 13 
Brood IV— Tredecim— 1909 43 
Brood XI— Septendecim— 1910 44 
Brood VI— Tredecim— 1910 IE 
Brood XII— Septendecim— 1911 16 
Brood XIII — Septendecim — 1912 IT 
Brood XIV— Septendecim— 1913 
Brood XV— Septendecim— 1914 19 
S\ stematic position and structural details 50 
The month parts, or beak 53 
The ovipositor " ; 
The musical apparatus 56 
The song notes of the periodical Cicada 57 
The so-called sting of the Cicada 59 
