Tongue short, compared with the length of the bill, pointed, armed with a few spines at the base; trachea of moderate size, acted upon by one pair of sterno-tracheal muscles, which go off to the sternum, about ⅛ of an inch above the inferior larynx; from the upper ring of the bronchiæ on each side, a process proceeds upwards to the point from which the muscles diverge, to which point only the rings of the trachea are continued, two spaces therefore, one on the anterior, the other on the posterior side of the trachea, immediately above the bronchiæ, are left devoid of osseous matter, being bounded laterally by the process above mentioned, inferiorly by the upper rings of the bronchiæ, and superiorly by the lower ring of the trachea, which is slightly enlarged; œsophagus small, slightly dilated a little above the proventriculus, which is of moderate size, and not contracted before entering the gizzard; gizzard large, oval, very muscular, inner coat hardened, deeply furrowed longitudinally, and filled with the remains of insects; intestinal canal of moderate size, without cæca; rectum very slightly enlarged; liver bilobed. Inches Length of œsophagus, including proventiculus 2 of gizzard ¾ Breadth of ditto ½ Length of intestinal canal 10 With the exception of being larger than _Furnarius cunicularius_, and in having the bill more bent and longer, the skeleton presents no material difference from that of the above-named bird. lines Length of sternum 13 Breadth anteriorly 6 posteriorly 7¼ Depth of keel 4 of fissures 4 Breadth of ditto 1 Length of pelvis 14¼ Breadth anteriorly 4 posteriorly 9¼ Length from occiput to point of bill 27 Breadth of cranium 8 Length of coracoids 11 No. of cervical vertebræ 11 dorsal ditto 7 sacral ditto 11 caudal ditto 6 ——— Total 35