My original tumblr post was here. This image was originally blogged on tumblr by Monsters in Love, who tagged it with “…which is why we don’t nude-sunbathe on the roof.” MiL identifies it as being from the March 1957 cover of Amazing Stories. It comes to us via notpulpcovers. Confirmation of MiL’s identification comes from the Wikipedia article on Harlan Ellison (accessed May 13, 2016), which includes an uncroped version of the cover…

…with this caption.

Ellison’s 1957 novelette “The Savage Swarm”, cover-featured in Amazing Stories, has never been included in an authorized collection or anthology.