B I O L O G I A 



GENTRALI-AMERICANA. 



IN SECT A. 



DIPTERA. 



Vol. I. 



BY 



Baron C. R. OSTEN SACKEN, Hon. F.E.S. 

 THE SUPPLEMENT 



BY 



Professor S. W. WILLISTON, 



OP THE UNIVERSITY OF KANSAS ; 



Professor J. M. ALDRICH, 



OF THE UNIVERSITY OF IDAHO J 

 AND 



Professor W. M. WHEELER and A. L. MELANDER, 



OF THE UNIVERSITY OF TEXAS. 



1886-1901. g ^ 



JUL 3 1 1961 



„*«RAt« 



