Technical Series No. 21. 



U. S. DEPARTMENT OF AGRICULTURE, 



L. 0. HOWARD, Entomologist and Chief of Bureau. 



/vTJ 



SYNOPSIS, CATALOGUE, AND 

 BIBLIOGRAPHY OF 



NORTH AMERICAN THYSANOPTERA, 



WITH DESCRIPTIONS OF NEW SPECIES. 



BY 



DUDLEY MOULTON, 



Deputy State Commissioner of Horticuhure for CaUfoi~nia. 



Issued June 13, 1911. 



1 





'^0.. 



JliM gl 1 



WASHINGTON: 



GOVERNMENT PRINTING OFPIOE. 



1911. 



