The author serves as Great Plains Coordinator for the Season Summary of the Lepidopterists' Society, and records presented here are based on review of Season Summary and similar published field reports. Only professional, published, specimen-vouchered or photographically confirmed records are included. As far as possible, images are of butterflies actually collected in North Dakota. In a few cases involving non-breeding immigrant species, they are of individuals from adjacent states or provinces which were carefully selected for their similarity to what one would encounter in North Dakota. Entries marked with this icon contain textual information about the species.
All entries have distribution maps.
Counties shaded dark blue have reliable records for the species indicated. Counties shaded light blue have only questionable or historic records. The new maps were checked for errors, but there is a possibility that some errors remain. Many of the original maps have been updated to reflect new sightings. This resource is updated quite frequently.