Maybe they are reversed Kzinti and only women are inteligent. BTW, Enterprse was toying with idea to bring back "Nivenverse" into it´s hypothetical season 5. Should Disco grab this challenge?According to Memory-Alpha, the name 'Caitian' first appeared in merchandising. It was in a M'Ress biography published by 'Lincoln Enterprises'
Same biography actually says the Caitians are related to the Kizinti, which is backed up by Larry Niven apparently.