of the building, all co-operating, however, in the common endeavour to concentrate the nests under one substantial straw thatch, and thus ensure the safety of the whole flock. These aerial cities are generally built upon large branches at a considerable elevation, but the Tree Aloe is occasionally selected as affording suitable support. The brood of the Social Weaver Bird consists of three or four blueish-white eggs, marked with small brown spots at their broadest end. The young are fed entirely upon insects, which are only occasionally eaten by the parents. THE GOLDEN WEAVER BIRD. The GOLDEN WEAVER BIRD (_Ploceus galbula_), the type of a numerous group, is an inhabitant of Eastern Soudan. This bird and its congeners are all slenderly formed, and of moderate dimensions, possessing a slightly curved and shallow beak, the base of which appears to join the forehead at an acute angle; the feet are strong, the wings moderately long, reaching past the tail-covers; the tail is of medium length, and abruptly rounded; the third, fourth, and fifth quill-feathers are the longest, the first being rudimentary. The adult male is a most beautiful creature, the top and sides of its head, and all the lower portion of its body, being of a bright lemon colour. The region of the eyes, and the parts around the lower mandible are bright red; the back and wing-covers a brilliant green, with darker shafts to the feathers; the quills and tail are reddish brown, bordered with yellowish green; the iris is reddish brown, the beak black, and the feet yellow. In the female the forehead is of a greenish yellow; the back of the head, nape of neck, and mantle bright green; the shafts of the feathers are of a deeper shade; the throat is a dirty white, the upper mandible deep brown, the lower one somewhat paler. The young male resembles the mother, but is distinguished by the dusky yellow upon its throat. [Illustration: NEST OF MAHALI WEAVER BIRD.] [Illustration: NEST OF SOCIAL WEAVER BIRD (_Philetaërus socius_).]