daddy long-legs spider vs harvestman

daddy long-legs spider

noun
  • Any of the true spiders of the family Pholcidae: small spiders with long legs. 

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. 

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