Si 



CLASS BOOK 



^l^ OF 



/J- 



ECONOMIC ENTOMOLOGY 



WITH SPECIAL REFERENCE TO THE ECONOMIC INSECTS 

 OF THE NORTHERN UNITED STATES AND CANADA 



BY 



WILLIAM LOCHHEAD, B. A., M. S. (Cornell) 



PROFESSOR OF BIOLOGY IN THE MACDONALD COLLEGE OF McGILL UNIVERSITY; F. A. A. S. 



MEMBER OF THE ENT. SOC. OF AMERICA, AND THE AM. ASSOC. ECON. ENT.; 



EX-PRESIDENT ENT. SOC. OF ONTARIO; PRESIDENT QUEBEC SOC. FOR 



THE PROTECTION OF PLANTS, ETC. 



WITE 257 ILLUSTRATIONS 



PHILADELPHIA 



BLAKISTON'S SON & CO. 



1012 WALNUT STREET 



