MANUAL 



OF THE 



FAMILIES AND GENERA 



TH AMERICAN DIPTERA 



SECOND EDITION 

 REWRITTEN AND ENLARGED 



SAMUEL W. WILLISTON 



PROFESSOR OF PALEONTOLOGY AND ANATOMY 

 UNIVERSITY OF KANSAS 



NEW HAVEN 

 JAMES T. HATHAWAY 



297 CROWN ST. NEAR YALE COLLEGE 



1896 



