L 



SB 

 818 

 C578 

 ENT 



Issued July 15, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— CIRCULAR No. 151. 



L. O. HOWARD. Entomologist and Chief of Bureau. 



THE GREENHOUSE THRIPS. 



II. :\I. RUSSELL, 



Entomological Assistant. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1912 



