daddy longlegs vs harvest spider

daddy longlegs

noun
  • Any (non-spider) arachnid of the order Opiliones, mostly with long thin legs; the harvestman. 

  • The daddy long-legs spider, any spider of the family Pholcidae. 

  • The cranefly; any insect of the suborder Tipulomorpha. 

harvest spider

noun
  • harvestman; daddy longlegs 

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