

Bulletin 



OF THE 



Illinois State Laboratory 



Natural History 



Urbana, Ii^linois, U. S. A. 



STEJPHEN A. FORBES, Ph. D., LI,. D.. 

 Director 



Vol. XIL March, 1917 Article III. 



A PRELIMINARY CLASSIFICATION OF DIPTERA, EXCLUSIVE 



OF PUPIPARA, BASED UPON LARVAL AND PUPAL 



CHARACTERS, V/ITH KEYS TO IMAGINES 



IN CERTAIN FAMILIES. PART I. 





"-"'".'■/i//'-^' 



--r^/. 



BY 



JoHN R. Malloch "-=--^ 





'<^!}^n^ Mu8i«<<^ 



