Sternum with the keel very deep, its edge rounded, and projecting anteriorly; posterior margin rounded, and destitute of indentation or fissure; the ridges to which the pectoral muscles have their attachment, large and prominent, the horizontal portion much narrowed anteriorly, consequently the junctions of the coracoids are very near together. Pelvis short, very broad; os pubis long, curved upwards at the extremities, projecting far downwards, and posteriorly beyond the termination of the caudal vertebræ; the ischiatic foramen small, and linear; femora placed far backwards; coracoids short, very strong, their extremities much diverging; os furcatum short, slightly arched near the extremities of the rami, which are far apart, furnished with only a small process on its approach to the sternum; scapula flattened, long, broadest near the extremity; humerus, radius, and ulna short, the metacarpal bones longer than either; the former furnished with ridges much elevated for the attachment of the pectoral muscles; caudal and dorsal vertebræ with the transverse processes long, and expanded; cranium of moderate strength, the occipital portion indented with two furrows, which pass over the vertex, and in which the hyoids lie; orbits large, divided by a complete bony septum; the lachrymal bones large, causing an expansion of the bill near the nostrils. lines Length of sternum 13¼ Breadth anteriorly 4 posteriorly 7¼ Depth of keel 6¾ Length of pelvis 6¼ Width anteriorly 2½ posteriorly 7 Length from occiput to point of bill 27½ Breath of cranium 6½ Length of coracoids 6 No. of cervical vertebræ 10 dorsal ditto 6 sacral ditto 9 caudal ditto 5 ——— Total 30 No. of true ribs 5 false ditto 1·3 ——— Total 9 Remarks:—The skeleton of this bird does not differ in form from that of _Trochilus pella_, figured at page 270 of the Cyclopædia of Anatomy and Physiology. The whole of the group are more nearly allied to fissirostral birds than any other. TINOCHORUS RUMICIVORUS. _Eschsch._ (Male.)