lacertian vs ophidian

lacertian

adj
  • Pertaining to or resembling a lizard; lizard-like. 

noun
  • A member of the Lacerta. 

ophidian

adj
  • Of or pertaining to the suborder Serpentes; of, related to, or characteristic of a snake or serpent. 

noun
  • Any species of the suborder Serpentes; a snake or serpent. 

How often have the words lacertian and ophidian occurred in a corpus of books? (source: Google Ngram Viewer )