The sap beetle family Nitidulidae is one of the most diverse families of beetles containing 4,500 species in 350 genera worldwide (lipiski, Leschen, and Lawrence, 2011). The subfamilies Carpophilinae and Epureainae contain some of the most economically and ecologically significant species which can be difficult to identify using current literature. I provide an overview of features and technical specifications used to build an interactive web-based key for identification of Carpophilinae (Coleoptera: Nitidulidae) in eastern North America. The terminal taxa list used in the key represents the most current account of carpophiline diversity known to occur in the area. I also provide redescription of the larvae and first description of the pupae of Epuraea ocularis Fairmaire (Nitidulidae), and diagnosis for the adult. Habitus and character images used for the descriptions are provided. New state records for this non-native sap beetle are reported for Georgia and California, illustrating a large range expansion across North America.