Author:Arthur Olney Friel

Works
In Adventure magazine

Pedro and Lourenço stories

 * The Snake (September 18, 1919)
 * The Sloth (October 18, 1919)
 * The Spider (December 1, 1919)
 * The Jaguar (January 3, 1920) (probably not part of series)
 * The Jabiru (January 18, 1920)
 * Clay John (February 3, 1920)
 * The Peccaries (March 3, 1920)
 * The Vampire (April 18, 1920) (probably not part of series)
 * The Mother of the Moon (June 18, 1920)
 * The Armadillo (August 18, 1920)
 * The Tapir (October 3, 1920)
 * The Firefly (November 3, 1920)
 * The Tucandeira (December 3, 1920) novelette
 * The Vulture (January 3, 1921)
 * The Tailed Men (February 18, 1921)
 * Wild Women (March 13, 1921)
 * The Trumpeter (May 3, 1921)
 * The Barrigudo (June 3, 1921)
 * The Ant Eater (July 18, 1921)
 * The Bouto (July 18, 1921)
 * The Jararaca (December 30, 1921) novella
 * Black Hawk (March 10, 1922) novella
 * Tupahn—the Thunderstorm (May 10, 1922) novelette
 * Scarlet Face (June 1, 1929)

McKay, Ryan and Knowlton

 * The Pathless Trail (1922) IA : PG
 * Tiger River (1923)
 * The King of No Man's Land (1924)
 * Mountains of Mystery (1925)

Loco León and Black White

 * Black White (1923 Sept, Adventure magazine)  novel
 * The Thirty Gang (1923 Oct, Adventure magazine) novel
 * Gray (1926 Mar 10, Adventure magazine) novella

Other stories

 * King—of Kearsarge (1921)	 hathitrust
 * Cat o' Mountain (1923)
 * "Thirty Days After Death" (1924 Nov 29, The Saturday Evening Post) ss
 * "Apples" (1925 Jan 31, The Saturday Evening Post) ss
 * "Twenty-Four Hours" (30 Dec 1925, Adventure magazine) novelette
 * "The Ogre" (1926 Oct 23, Adventure magazine) novelette
 * In the Year 2000 (1928 May 15—June 15, Adventure magazine) 3-part serial