On this day in 1940, John T. S. Hunn and Miriam Minton were birding south of South Plainfield in Middlesex County. The original goal of their day was to find Upland Sandpipers, but Hunn heard a song he recognized from trips out west as belonging to a Western Meadowlark. Although Hunn returned to the location several times during May 1940, the bird was never refound.
It was a good thing that Hunn knew the Western Meadowlark's song, since Eastern and Western meadowlarks look very similar and the best method of distinguishing them is by song. There have been seven accepted records since, all from the spring to summer season. In contrast to many NJ rarities, all Western Meadowlarks so far have been away from the expected coastal rarity magnets such as Cape May or Sandy Hook.
Hunn, John T. S. 1941. Western Meadowlark in New Jersey. Auk 58:265. PDF here