Bulletin 



OF THE 



Illinois State Laboratory 



OF 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph. D., EL. D. 

 Director 



Vol. XII. March, 1917 Article III. 



A PRELIMINARY CLASSIFICATION OF DIPTERA, EXCLUSIVE 



OF PUPIPARA, BASED UPON LARVAL AND PUPAL 



CHARACTERS, WITH KEYS TO IMAGINES 



IN CERTAIN FAMILIES. PART I. 



BY 



John R. Malloch 



