Mary Florence Wells Slater was an American entomologist and educator. After graduating from St. Mary's School in 1882, she served on the faculty there as a science teacher. Slater went on to study entomology at Cornell University, working as a research assistant for John Henry Comstock. In 1899 she published the article The Egg-Carrying Habitat of Zaitha, which made corrections to an error in Comstock's earlier published work. She went on to teach within the New York City Department of Education, most notably at Washington Irving High School in Gramercy Park. Slater was an advocate for teacher pensions in New York and for equal pay for equal work in the United States.