The dot-winged antwren is a passerine bird in the antbird family. In the past it was sometimes known as the velvety antwren, and some of its more distinctive subspecies have their own infrequently used English names. It is a resident in tropical Central and South America from southeasternMexico south to western Ecuador, northern Bolivia, central Brazil and the Guianas. It is the only member of the genusMicrorhopias. This is a common bird of the understory of wet forest, especially at edges and clearings, tall second growth, and in cacao plantations. The female lays two brown-spotted white eggs which are incubated by both sexes, in a small, deep, plant fibre and dead leafcup nest 1–12 m high in a tree on a thin twig in thick foliage. The male and female parents both feed the chicks. The dot-winged antwren is a warbler-like bird, typically 11 cm long, and weighing 8.5 g. The adult male is mainly velvety black, with a broad white wing bar and white spotson the wingcoverts. The female shares the male's wing pattern, but has dark slate upperparts and rufous underparts. There are significant variations in the plumage depending on the exact subspecies; in the male this mainly involves the amount of white in the wings and tail, and this is reflected in the female. However, in the female the subspecies also differ in the darkness of the upperparts, and the amount of rufous below. Young birds are sooty-brown above, shading to dull cinnamon below. The underpart colouration is more extensive and more rufous in young females. This species has a whistled peep call, and the song is an ascending whistle and trill, chee chee chee-che-che-chr,r,r,r, but with some geographical variations. The dot-winged antwren is found as pairs or family groups, and sometimes with other antwrens as part of a mixed-species feeding flock It feeds on small insects and other arthropods taken from twigs and foliage in the thickets or vine tangles. It is often seen foraging in more exposed positions than its relatives. The genus Microrhopias was erected by the English zoologist Philip Sclater in 1862.
