SMITHSONIAN INSTITUTION 

 UNITED STATES NATIONAL MUSEUM 



Bulletin 168 



NEARCTIC COLLEMBOLA 



OR SPRINGTAILS, OF THE FAMILY 



ISOTOMIDAE 



BY 



J. W. FOLSOM 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1937 



For sale by the Superintendent of Documents, Washington, D. C. ---------- Price 30 cents 



