This is another unknown-to-me reference from Vathek. I Googled key words but didn't find anything, so I thought I'd ask here again in case anyone knew. Has anyone here ever heard of a specific kind of nocturnal insects that superstitious Muslims think presage evil? Here's the original French sentence where the reference is found, and an English translation: "Les bons Musulmans crurent entendre le bourdonnement de ces insectes nocturnes qui sont de mauvais présage." "The good Mussulmans fancied that they heard the sullen hum of those nocturnal instects, which presage evil."