U. S. DEPARTMENT^ AGRICULTURE, 
division of entomology. 
Bulletin No. 8. 
( s *: c o :* r> p: d i t i o > r . 
the: 
PERIODICAL CICADA. 
AN ACCOUNT OF CICADA SEPTENDEC1M AND ITS TREDECIM RACE. WITH 
A CHRONOLOGY OF AEL BROODS KNOWN. 
BY 
CHARLES V. RILEY. Ph. D. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1 8 8 5 . 
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