"Snake priest", plate #418 from The Hopi Portfolio, vol. 12 of <i>The North American Indian</i>.  A search of the <a rel="nofollow" class="external text" href="http://memory.loc.gov/ammem/award98/ienhtml/curthome.html">online version</a> of <i>The North American Indian</i> by Edward S. Curtis using that description finds the following supplemental information by Curtis: "The white markings, typifying the antelope, indicate that the subject is accoutred for the semi-final day of the Snake dance, when the public performance consists of the dance and the ceremonial race of the Antelope fraternity."
<bdi><a href="https://en.wikipedia.org/wiki/en:Edward_S._Curtis" class="extiw" title="w:en:Edward S. Curtis"><span title="American photographer (1868-1952)">Edward S. Curtis</span></a>
</bdi>
circa 1900 <div style="display: none;">date QS:P,+1900-00-00T00:00:00Z/9,P1480,Q5727902</div>
Library of Congress, Prints &amp; Photographs Division, Edward S. Curtis Collection, [reproduction number, LC-USZ62-97091 (b&amp;w film copy neg.)