Note 15 — BULLETIN OF THE NUTTALL ORNITHOLOGICAL CLUB. VOL. VII. January, 1882. No. I.

This arrangement leaves a large portion of the Middle Province without any characteristic representative, maxwellæ being an Alpine form apparently confined to the Rocky Mountains, while kennicotti and “tricopsis” respectively invade only its northern and southern borders. Our knowledge of the subject is not as yet sufficiently comprehensive to enable me to fill this gap, but all the available evidence goes to show that asio, at least as above defined, is not found to the westward of the Rocky Mountain range.