MAR 26 1917 



Bulletin 



OF THE 



Illinois State Laboratory 



ov 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph. D., LE. D. 

 Director 



Vol. XII. March, 1917 Article III. 



A PRELIMINARY CLASSIFICATION OP DIPTERA, EXCLUSIVE 



OF PUPIPARA, BASED UPON EARVAL AND PUPAL 



CHARACTERS, WITH KEYS TO IMAGINES 



IN CERTAIN FAMILIES. PART I. 



BY 



John R. Malloch 



