Astounding vol. 25, no. 5 (July 1940)
I can't make out exactly what's going on behind them, there's a dome? A fishbowl?
Interesting representation of dark-skinned people for 1940 but you'd have to read the story to see if it was related to/analogous to race in the human sense.
Original magazine: https://archive.org/details/Astounding_v25n05_1940-07_dtsg0318