harvestman vs recluse spider

harvestman

noun
  • An order of terrestrial, non-venomous arachnids with often very long legs: Opiliones. 

  • A field-worker who works to gather in the harvest. 

recluse spider

noun
  • Any of many small venomous spiders of the genera Loxosceles and Sicarius. 

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