XII. The Hydrophildæ of Ontario and Qubec (concluded).

This paper can scarcely be considered in any sense an original one since it consists almost entirely of tables published in greater detail by Dr. Horn in his reviews of this portion of the Hydrophilidæ. By removing the extra-limital forms, I have been able in some cases to modify the synopses so as to make them a little easier to follow, and it is hoped that they will prove of use to many students of the Canadian fauna who may not see the more complete originars. with this prelude, which will place the credit where it properly belongs, we may proceed.