X CONTENTS. 



PACK 



O.n the Nobth American Cecidomyidae. By R. Osten Sacken . 173 



On the classification of the family . . . 173 



On its habits . . . . . .179 



On the North American Cecidomyiae at present known 186 



Index ........ 207 



Additions and Corrections ...... 22(> 



