Career
She was called "Madame Dragonfly" for her extensive work. She had an analytical mind and was passionately fond of dragonflies. Her dominant area of interest was natural history.
She travelled extensively and published The Dragonflies of the British Isles in 1937.
Longfield was the expert on the dragonflies at the museum, researching particularly African species. After retirement from the NHM she returned to Castle Mary, the family estate, in Cloyne, County Cork where she lived until her death.
