T! 



- ; 9 ' ' ' 



THE 



ANATOMY OF THE MOUTH-PARTS 



AND OF THE SUCKING APPARATUS 



OF SOME DIPTERA. 



i 



( 



DISSERTATION 



FOR THE PURPOSE OF OBTAINING 



^ i THE PHILOSOPHICAL DOCTOEATE 



AT THE LEIPZIG UNIVERSITY, 



BY 



OF CAMBRIDGE, MASS., U. S. A. 



BOSTON: 



A. WILLIAMS & CO. 



1881. 



