The Prince von Wied tells us he only met with these elegant little birds upon the arid interior highland tracts of Geroes and Bahia, where they inhabited the open country, and passed their time in hopping or flying from one bush or tree to another. As regards its nidification, the Prince von Wied remarks, "I found the nests of the _Phacellodomus rufifrons_ about February; they were usually suspended on the low, slender branches of high trees. Those I saw are best described as large oval bundles, often more than three feet long, and formed of thin twigs heaped together and interwoven with each other, or fastened together by a variety of materials. The interior was filled with small bundles of moss, hair, wool, or fibres interlaced, so as to form a warm and compact lining. The small round hole that serves as an entrance is situated at the bottom of this suspended mass, so that the birds ascend from below into their huge domicile. Year by year these nests are added to and enlarged until at last it is not uncommon to find that they have so increased in size as to render it a difficult task for a man to stir one of them. On opening a nest of this description a row of chambers is seen, under the one last made." These ancient apartments are, we believe, frequently employed as retiring-rooms for the male parent. Swainson tells us that these strange and shapeless masses are very conspicuous features in the landscape. The brood usually consists of four eggs, which are round in shape, and generally of a pure white. * * * * *