In the Journal of the New York Entomological Society, X., 140, 1902, footnot, Mr. Coquillett called attention to a serious error of mine in my revision of what I called the Psilopinæ (Diptera, family Dolichopodidæ), by which I applied the new name Gnamptopsilopus to that portion of the old gensu psilopus containing the type species platypterus. But little investigation was needed to assure me that the criticism was just.