White-lined Tanagers are sexually dimorphic, meaning males and females differ in appearance.
Males have a black plumage, with white markings beneath the wing.
Females are reddish-brown.

1st & 2nd photo: A male. El Cairo area, Valle del Cauca, Colombia, 10 June 2016
3rd photo: A male. Old Buenavista Road, Cali area, Valle del Cauca, Colombia, 13 June 2016
4th & 5th photo: Pozo Azul, Minca area, Sierra Nevada de Santa Marta, Colombia, 31 October 2014