GUIDE 



TO 



,THE STUDY OF INSECTS,, 



AND A TREATISE ON THOSE 



ItfJUEIOUS AND BENEHCIAL TO CKOPS : 



FOR THE USE OF 



COLLEGES, FARM-SCHOOLS, AND AGRICULTURISTS, 



BY 



A. S. PACKARD, JK., M.D. 

 \\ 



WITH FIFTEEN PLATES AND SIX HUNDRED AND SEVENTY WOOD-CUTS. 



FOURTH EDITION. 



SALEM : 

 NATURALISTS' AGENCY 



BOSTON: ESTES & LAURIAT. 



NEW YORK: DODD & MEAD. 



LONDON: TRUBNER & co. 



1874. 



