One of their peculiarities is that they feed on one tree for as long as a fortnight at a time, at last causing the decayed tree to fall.

The birds are exceedingly rare in the museums.

They are only found in the Sierra Madre.

On my journeys I saw them as far south as the southernmost point which the Sierra Madre del Norte reaches in the State of Jalisco, above the Rio de Santiago.

I frequently observed them also in the eastern part of the range.
Here, too, a great many specimens of the rare Mexican titmouse and some beautiful varieties of the duck tribe were procured.
A few days after our arrival at the Rancheria de los Apaches, Professor Libbey left our camp, returning to the United States by way of Casas Grandes.