T 



An Introductio7i to 



ACAROLOGY 



Edward W. Baker^ 



BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 



AGRICULTURAL RESEARCH ADMINISTRATION 



UNITED STATES DEPARTMENT OF AGRICULTURE 



G. W. Wharton 



DEPARTMENT OF ZOOLOGY, DUKE UNIVERSITY 

 DURHAM, NORTH CAROLINA 



THE MACMILLAN COMPANY 



JVew York 



