Rusty-bellied Brushfinch

The rusty-bellied brushfinch (Atlapetes nationi) is a species of bird in the family Passerellidae, the New World sparrows. It is endemic to Peru. == Taxonomy and systematics == The rusty-bellied brushfinch was formally described in 1881 with the binomial Buarremon nationi. Its specific epithet honors William Nation, who provided the type specimen. Genus Buarremon was merged into Atlapetes early in the twentieth century. Various authors have treated the rusty-bellied brushfinch as conspecific with one of the slaty brushfinch (A. schistaceus) or the bay-crowned brushfinch (A. seebohmi). The rusty-bellied brushfinch has two subspecies, the nominate A. n. nationi (Sclater, PL, 1881) and A. n. brunneiceps (Berlepsch and Stolzmann, 1906). == Description == The rusty-bellied brushfinch is 17 to 19 cm (6.7 to 7.5 in) long and weighs about 40 to 43 g (1.4 to 1.5 oz). The sexes have the same plumage. Adults of the nominate subspecies have a black forehead and a dark olive crown. Their face is black with a wide white lower cheek and a thin black line below the front of it. Their upperparts are lead gray; their wings and tail are slightly darker with white on the marginal coverts. Their chin is black and their throat…