The Passerini’s Tanager (Ramphocelus passerinii) and the Cherrie’s Tanager (Ramphocelus costaricensis) were formerly considered one single species, known as the Scarlet-rumped Tanager.
The Scarlet-rumped Tanager was split into Passerini’s Tanager on the Caribbean side and Cherrie’s Tanager on the Pacific side of Costa Rica and Panama.
These two sub-species differ mainly in some subtle colorations of the female.
The Passerini’s Tanager was named for Carlo Passerini, a professor at the Museum of Zoology of the University of Florence.
