BLAKISTON'S SCIENCE SERIES 



ENTOMOLOGY 



WITH SPECIAL REFERENCE TO 



ITS BIOLOGICAL AND ECONOMIC ASPECTS 



BY 



JUSTUS WATSON FOLSOM, Sc.D. (HARVARD) 



ASSISTANT PROFESSOR OF ENTOMOLOGY AT THE UNIVERSITY OF ILLINOIS 



SeconD IRevisefc 

 tfour plates anfc 304 



PHILADELPHIA: 



P. BLAKISTON'S SON & CO 

 1 01 2 WALNUT STREET 



... i . ; i 9 i, 3 ; : jvii; 



