harvestman vs mosquito hawk

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. 

mosquito hawk

noun
  • A crane fly (US) / daddy longlegs (UK), a large, mosquito-like insect in the suborder Tipulomorpha 

  • Any of various species of dragonfly of the genus Micromidia, endemic to eastern Australia. 

  • A dragonfly. 

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