JW,
Page 9 in the book "North American Bows, Arrows, and Quivers (Otis Tufton Mason) paragraph 4.....Tufton quoting Baegert and Coville (1893) as follows......
"The bow of the Chemehuevis (Shoshonean) is characteristic of the stock to which they belong, being of hardwood common in the region, elegantly backed with sinew and bound with shredded sinew, ornamented also at the ends by the skin or rattle of the Rattlesnake.* The type belongs to the stock everywhere."
* the footnote reads: Whipple, etc., Pac.R.R.Rep., vol. III, p. 32, pl.41, bow and quiver.
rich
PS: Tufton Mason was with the Smithsonian Institution in the late 1800's