In a letter (#253) to August Derleth, ca. after July 9, 1933, he mentions the story:

Thanks for your comments concerning “The Man on the Ground”; I rather like the yarn, myself, because of its efforts at realism.

To Carl Jacobi (letter #297), ca. Summer 1934, we learn:

You ask me why I do not use Texas settings more in my stories. I really should, since Texas is the only region I know by first hand experience. Three of my yarns in Weird Tales have been laid in Texas: “The Horror From the Mound”, “The Man on the Ground” and “Old Garfield’s Heart”. Sometimes too thorough a knowledge of a subject is a handicap (not that I claim to be an authority on the Southwest, or anything like that; but I was born here and have lived here all my life.) for fiction writing.