My original tumblr post was here. These images were originally posted on tumblr by Diabolik Diabolik and identified as being from Planet Stories #11, 1942 (that would be Summer 1942; the ISFDB link for the issue is here), with an attribution of the cover art to Norman Saunders and the interior art to Winfield Scott Hoskins. The post comes to us via paranormallust-eroticart.
Its always good to see a magazine with Ray Cummings on the cover. Back in the 70s I worked in a building in downtown Chicago where Cummings ran one of his last ventures, Official UFO Magazine. It’s most famous for its report on Elvis’ Living Clone.
http://i.ebayimg.com/images/g/frgAAOSwBLlVCGub/s-l300.jpg