L. 



^c^^-^ Bulletin 



-^^NT ok the; 



Illinois State Laboratory 



OF 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph D., L,L.D., 

 Director 



Vol. XII. June, 1917 Article IV. 



THE ZYGOPTERA, OR DA MSEL-FL,IES, OF ILUNOIS 





BY 



Philip Garman, Ph.D. 



