17 cm. 33 g. Black bill. Chestnut iris. Top and sides of head black except white median stripe from mid-crown to hindneck. Rest of upperparts slate-black. Bright yellow on throat, at times also on belly. Grayish-white chest. White belly, grayish-brown flanks and feathers that cover undertail. Legs brown. Males and females are similar. Juveniles have sooty-black head, crown stripe indistinct and tinged with brown; upperparts dull blackish-brown; throat paler and more buffy; chest and flanks buffy-brown, shading to pale, dull buff on belly; below extensively and finely streaked with dusky.