>Words borrowed from a Pre–Indo-European language into Mediterranean languages

> [...] Greek μύρμηξ mýrmēx ‘ant’, Latin formica

Must be an error:

  Proto-Celtic *morwos
  Proto-Balto-Slavic: *marwis
  Proto-Indo-Iranian: *marwiš
  Proto-Germanic: *mauraz
  Old Armenian: mrǰimn

Greek murmēx could be an assimilation murw- => murm-, and Latin had dissimilation morm- => form- (although not clear what came first, maybe morm- was the original and morw- came later). Sanskrit also has vamra "ant", which makes it look like the whole thing is a tabooistic distortion of *wr̥mis "worm".

In any way, it doesn't look like it must be borrowed. Historically, some words once labeled Pre-Indoeuropean turned out to have pretty mundane PIE origins.