They select a low, strong, wide-spreading bush to build in; the nest, which is made of stout sticks, is perfectly spherical and four to five feet deep, the chamber inside being very large. The opening is at the side near the top, and is approached by a narrow arched gallery, neatly made of slender sticks resting along a horizontal branch, and about fourteen inches long. This peculiar entrance, no doubt, prevents the intrusion of snakes and small mammals. So strongly made is the nest that I have stood on the dome of one and stamped on it with my foot without injuring it in the least, and to demolish one I had to force my gun-barrel into it, then prize it up by portions. I examined about a dozen of these enormous structures, but they were all met with before or after the laying season, so that I did not see the eggs. 214. ANABAZENOPS OLEAGINEUS, Scl. (OILY-GREEN ANABAZENOPS.) +Anabazenops rufo-superciliatus+, _White, P. Z. S._ 1882, p. 613 (Catamarca). +Anabazenops oleagineus+, _Scl. P. Z. S._ 1883, p. 654. _Description._--Above and beneath dark olive-green; lores, superciliaries, and spots on the sides of the head yellowish white; wings blackish, the outer webs of the feathers olive-brown; tail bright chestnut; throat whitish yellow, on the lower part the yellow feathers tipped with olive; breast and belly spotted with same colour as the throat; bend of wing, under wing-coverts, and margins of inner webs of secondaries fulvous yellow; bill and feet blackish: whole length 6·2 inches, wing 3·2, tail 3·0. _Female_ similar. _Hab._ South Brazil and Argentina. White obtained examples of this species on the Sierra of Totoral. He says it is a very wild bird and exceedingly scarce. 215. SITTOSOMUS ERITHACUS (Licht.). (ROBIN-LIKE WOOD-HEWER.) +Sittosomus olivaceus+, _White, P. Z. S._ 1882, p. 613 (Salta). +Sittasomus erithacus+, _Scl. et Salv. Nomencl._ p. 66. _Description._--Above olive-green, tinged with chestnut on the back, rump, and upper wing-coverts; wings black, the basal part of the inner webs of the secondaries fulvous yellow, forming a well-marked transverse bar; outer webs and broad tips of inner secondaries and whole of outer secondaries chestnut; tail and upper tail-coverts chestnut; beneath yellowish olive, brighter on the throat and breast; under wing-coverts fulvous yellow; under tail-coverts pale chestnut; bill and feet black: whole length 6·2 inches, wing 3·0, tail 3·0. _Female_ similar. _Hab._ South America from Colombia to Northern Argentina. This is a straggler from the north, a specimen of which was obtained by White near Oran in 1880. 216. GLYPHORHYNCHUS CUNEATUS (Licht.). (WEDGE-BILLED WOOD-HEWER.) +Glyphorhynchus cuneatus+, _Scl. et Salv. Nomencl._ p. 67; _White, P. Z. S._ 1882, p. 613 (Misiones).