 The female lays two brown-blotched white or pale blue eggs, which she incubates for 12–14 days.The yellow-thighed finch is a long-tailed species, 18.5 cm long and weighing 31 g. The adult is mainly dark grey, becoming black on the crown, throat, wings and tail, and with an olive tinge to the belly and breast.The bright yellow thighs contrast with the otherwise drab plumage, and give this species its English and scientific names.