Technical Series, No. 13. 



U. S. DEPARTMENT OF AGRICULTURE. 



BURKATJ OF K]VTO]VIOLOGY. 



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



A REVISION OF THE TYROGLYPHIDJ^ 



UNITED STATES 



NATHAN BANKS, 



Assista7it Entomologist. 



Issued November 14, 1906. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE, 



1906. 



9(^94^ 



