Intriguingly, the magazine is from 1937. And while insects have always served as convenient templates for science fiction artists, it's curious that present-day extraterrestrial abductors should so closely resemble beings from pulp magazines.
Is the intelligence behind the close-encounter experience using SF devices as a way of interacting with us, much how a primatologist "communicates" with an orphaned monkey via hand-puppet? If so, how to account for descriptions of bug-like entities from populations who haven't been primed to know what an alien "should" look like? Maybe the "mantis" identity is simply a costume that works, in which case one can't help but yearn for a glimpse of next year's fashions . . .
*Although "everyday" encounters in normal consciousness aren't unheard of.
(Hat tip to Elan.)