JHR 77: 1–86 (2020)An updated checklist of the bees of Pennsylvania, United States of America 1 doi: 10.3897/jhr.77.49622 CHECKLIST http://jhr.pensoft.net An updated checklist of the bees (Hymenoptera, Apoidea, Anthophila) of Pennsylvania, United States of America Shelby Kerrin Kilpatrick1, Jason Gibbs2, Martin M. Mikulas3,4, Sven-Erik Spichiger3,5, Nancy Ostiguy1, David J. Biddinger1,6, Margarita M. López-Uribe1 1 Department of Entomology, Center for Pollinator Research, Pennsylvania State University, University Park, Pennsylvania, 16802, USA 2 Department of Entomology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada 3 Pennsylvania Department of Agriculture, Harrisburg, Pennsylvania, 17110, USA 4 USDA, Animal and Plant Health Inspection Service, Plant Protection and Quarantine, Lancaster, Pennsylvania, 17601, USA 5 Washington State Department of Agriculture, Olympia, Washington, 98501, USA 6 Fruit Research and Extension Center, Pennsylvania State University, Biglerville, Pennsylvania, 17307, USA Corresponding author: Shelby Kerrin Kilpatrick (
[email protected]) Academic editor: Michael Ohl | Received 8 February 2020 | Accepted 25 April 2020 | Published 29 June 2020 http://zoobank.org/366CC318-E0A7-4E8B-ACBC-C3110EB22224 Citation: Kilpatrick SK, Gibbs J, Mikulas MM, Spichiger S-E, Ostiguy N, Biddinger DJ, López-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. https://doi.org/10.3897/jhr.77.49622 Abstract Checklists provide information about the species found in a defined region and serve as baselines for detecting species range expansions, contractions, or introductions. Bees are a diverse and important group of insect pollinators. Although some bee populations are declining, these patterns are difficult to docu- ment and generalize due to a lack of long-term studies for most localities.