This bulletin is published by the Grand Canyon Natural History Association as a project in keeping with its policy to stimulate interest and to encourage scientific research and investigation in the fields of geology, botany, zoology, ethnology, archeology and related subjects in the Grand Canyon region. This number is one of a series issued at irregular intervals throughout the year.

Membership to the Grand Canyon Natural History Association is $1.00 per year and covers cost of all bulletins and other publications of the Association. Additional copies of this bulletin may be obtained at 15¢ each by addressing the Grand Canyon Natural History Association, Grand Canyon, Arizona.