a Able te Orteely tal NO 1S 
Dwicut H. Green, Governor 
DEPARTMENT OF REGISTRATION AND EDUCATION 
FRANK G, THompson, Director 
ewe TH es PO Rey S PeRsV Bey oD TV 1S' LOIN 
Tueopore H. Frison, Chief 
Volume 22 DalSaa lees alan. Article 2 
Studies of 
North American Plecoptera 
With Special Reference to the Fauna of Illinois 
eeedee RTS: ON 
THE LIBRARY OF THE 
NOV 20 1942 
UNIVERSITY OF ILLINOIS 
TATE 
Printed by Authority of the State of Illinois 
eRAB EA NT Ave leis TINE@HS 
September 1942 
