“D. alba, rostro nigro, carina mandibulæ superioris basique inferioris flava, capite grisco, _cenia_, macula supra oculos caudaque obscuris, dorso, alis maculaque inter rostrum et oculos nigris. Irides fuscæ; nucha et uropygium alba; pedes pallide ochroleuci, anterius cum membranâ digitos connectente obscuri.” Feet. In. Length of the body from the tip of the bill to extremity of the tail 2 5½ Length of the bill 0 4 Depth of the base of the bill 0 1¾ Length of the tail 0 8½ Length of the tail, exserted from feathers of the urupigium 0 3¾ Length of the thigh 0 6 Length of the tarsus 0 3 Length of the middle phalanges 0 4⅜ Breadth of wings expanded 6 4 Breadth between the wings from the first scapular joint 0 5 Length of the first joint 0 9 Length of the second joint 0 9¾ Length of the third joint 0 3¾ Length of the fourth joint, or pen-feathers 1 3 Length from the inner angle of the eye to the base of the beak 0 1 Breadth of the foot when expanded 0 5½ The plumage was clean, delicate, and very handsome, particularly about the head. From this bird I procured a small parasitical animal, probably a _Ricinus_, which was found rather numerous about its feathers, it is prettily marked on each side, with a silvery appearance on the back, when viewed through a microscope.