The White-lined Tanager is a medium-sized passerine bird. This tanager is a resident breeder from Costa Rica south to northern Argentina, and on Trinidad and Tobago. It occurs in semi-open areas including gardens. The bulky cup nest is built in a tree or shrub, and the female incubates three, sometimes two, brown-blotched cream eggs for 14–15 days. Adult White-lined Tanagers are 18.5 cm long and weigh 33 g. They are long-tailed and with a mostly black stout pointed bill. The adult male is glossy black, apart from white underwing coverts and a small white patch on the upperwing. These white areas are conspicuous in flight but otherwise rarely visible. Females and immatures are entirely rufous in plumage, somewhat paler below.