To the ornithologist the West Indies offer an assortment of field problems. In an area where it is unlikely that new species of birds will be discovered, and where the life histories of only a handful of birds are known, concentrated study of individual life histories becomes of prime importance. This paper represents the third formal life history study of a resident Puerto Rican bird and the second of a passeriform. BIAGGI’S work (1955) on the Puerto Rican race of the Bananaquit (Coereba flaveola portoricensis) was the first life history done on the island with any degree of thoroughness. More recently RODRÍGUEZVIDAL (1959) made a three-year study of the Puerto Rican Parrot (Amazona vittata vittata), which has brought to light interesting information on its previously unknown breeding habits. SPAULDING (1937) wrote three short papers in which she set down her observations on the nesting habits of three native birds.