The number of bee species by their most recent years of collection/observation in Pennsylvania. The number within each bar represents the total number of species in the specified time period. Of the species in the state, 366 (83.8%) have been detected between 2000–2018, while at least 56 species (12.8%) have not. No date of collection/observation was available for 15 species (3.4%).

  Part of: Kilpatrick SK, Gibbs J, Mikulas MM, Spichiger S-E, Ostiguy N, Biddinger DJ, Lopez-Uribe MM (2020) An updated checklist of the bees (Hymenoptera, Apoidea, Anthophila) of Pennsylvania, United States of America. Journal of Hymenoptera Research 77: 1-86.