FRANK R. PAUL'S MEN OF CALLISTO / CALLISTANS

In 1940, science-fiction art pionneer Frank R. Paul did pieces showing what life could be on other planets. In his own words:

Serenis, water city of Callisto: The people of Callisto love beauty and their city is built on a lake. It is a Venice of the Outer worlds.

Paul depicts tall clawed four-armed humanoids with slightly simian facies, bleu skin and flowing white hair.

 

Source: Frank R. Paul, Amazing Stories