I'm trying to identify a Fading Suns sourcebook I remember. One of the two species it described is insectoid and the other is reptilian. Above the back cover blurb in large print is a quote of someone warning, "Stay away from the bugs and the lizards, they're hiding something!"
It's Orphaned Races: Ascorbites & Hironem, published in 2003. The back cover ad copy starts with:
“If there’s one thing I’ve learned in my years as a merc, it’s stay away from the Bugs and Lizards. They’re both hidin’ somethin’!”
Orphaned Races examines two of the sentient races of the Fading Suns™ universe: The insectoid Ascorbites and the reptilian Hironem. […]