Dendroica adelaidae Baird, 1865 Adelaide's warbler (Setophaga adelaidae), or reinita mariposera (in Puerto Rican Spanish) is a bird endemic to the archipelago of Puerto Rico belonging to the genus Setophaga of the family Parulidae (New World warblers).

The S. adelaidae complex was originally considered a single species, with three populations occurring in Barbuda, Puerto Rico and St. Lucia.

[2] In 2011, the American Ornithologists' Union reclassified the Parulidae, which resulted in D. adelaidae being transferred to the genus Setophaga.

The species usually travels in mixed flocks which commonly include Puerto Rican todies, vireos and other New World warblers.

Adelaide's warblers build nests at heights of 1 to 7 m in which the female deposits anywhere from 2 to 4 white eggs.