In the “West American Scientist” for January, 1891, I gave a brief description of Rhaphiomidas acton n. sp. comparing it with the only other described species R. episcopus O.S. The description was drawn from a single male speciment now in the National Museum at Washington, but during the past season I was fortunate enough to capture four additional specimens of this species, three males and a female, all of them having been taken on the wing while hovering over flowers in the hottest part of the day, the time being the first week in July. The possession of these specimens permits me to make a few corrections to my publihsed description.