Technical Series, No. 23, Part II. 



U. S. DEPARTMENT OF AGRICULTURE. 



BXJRKA.TJ OF ENTOMLOLOGJ-Y. 



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



MISCELLANEOUS PAPERS. 



AN INTERNAL PARASITE OF 

 THYSANOPTERA. 



BY 



H. M. RUSSELL, 



Entomological Assistant. 



Issued April 27, 1912. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1912. 



