Although I have no satisfactory evidence that these birds resort to a kind of hybernation for short periods during some portions of the year, I must not omit to mention that I have been assured that they do occasionally retire to and remain secluded in the hollow parts of the trees; and if such should prove to be the case, it may account for the extreme obesity of many of the individuals I procured, which was often so great as to prevent me from preserving their skins. I trust that these remarks will cause the subject to be investigated by those who are favourably situated for so doing; for my own part I see no reason why a bird should not pass a portion of its existence in a state of hybernation as well as some species of quadrupeds, animals much higher in the scale of creation. So great a similarity in plumage reigns throughout the first four of the species enumerated below that I have thought it unnecessary to figure more than two, viz. _P. humeralis_ and _P. Cuvieri_; the other two may be readily distinguished by the descriptions I have given of them, particularly if the localities be attended to. 40. Podargus megacephalus. _Caprimulgus megacephalus_, Lath. Ind. Orn. Supp., p. lviii. _Great-headed Goatsucker_, Lath. Gen. Syn. Supp., vol. ii. p. 265.—Shaw, Gen. Zool., vol. x. p. 141.—Lath. Gen. Hist., vol. vii. p. 364. _Wedge-tailed Goatsucker_, Lath. Gen. Hist., vol. vii. p. 368? _Podargus Stanleyanus_, Lath. MSS., Vig. & Horsf. in Linn. Trans., vol. xv. p. 197? In the general colouring, form and arrangement of its markings, this species so closely resembles the _P. humeralis_, that one description applies equally to both; but it may be distinguished by its being somewhat larger in the body and much larger in the head, and by the very great development of the mandibles. It inhabits the brushes of the east coast, and in its habits and economy resembles the other species of the group. 41. Podargus humeralis, _Vig. & Horsf._ Vol. II. Pl. 3. 42. Podargus Cuvieri, _Vig. & Horsf._ Vol. II. Pl. 4. 43. Podargus brachypterus, _Gould_. _Podargus brachypterus_, Gould in Proc. of Zool. Soc., Part VIII. p. 163. In its general appearance this bird closely resembles the _P. humeralis_, but is even smaller in size than _P. Cuvieri_, while at the same time the bill is larger than that of the former species, and projects much farther from the face than in any other of its congeners; it also differs in the shortness of its wings, which circumstance suggested the specific appellation I have assigned to it. It is a native of Western Australia. 44. Podargus Phalænoïdes, _Gould_ Vol. II. Pl. 5. 45. Podargus plumiferus, _Gould_ Vol. II. Pl. 6. Genus EUROSTOPODUS, _Gould_. Generic characters.