There is in my possession, presented to me by Mr. Hill with many other interesting objects, an egg of much beauty, which, when brought to him, was reported to be that of a Caprimulgus. It certainly belongs to this family, but not, as I think, to this species, judging from Wilson’s description. Its dimensions are 1²⁄₁₀ inch, by ⁸⁄₁₀, of a very regular oval, polished, and delicately and minutely marbled with white, pale blue grey, and faint olive. POTOO.[10] _Nyctibius Jamaicensis._ _Caprimulgus Jamaicensis_, +Gmel.+ _Nyctibius Jamaicensis_, +Vieill.+ _Nyctibius pectoralis_, +Gould+, Ic. Av. [10] Length 16 inches, expanse 33¹⁄₂, tail 7³⁄₄, flexure 11¹⁄₄, rictus 2¹⁄₂, breadth of beak at base measured within 2²⁄₁₀, tarsus ³⁄₁₀, middle toe 1³⁄₁₀. Irides hazel, orange-coloured, or brilliant straw-yellow; feet whitish, scurfy; beak black. Interior of mouth violet, passing into flesh-colour. Plumage mottled with black, brown, grey, and white; the white prevailing on the tertiaries, tertiary-coverts, and scapulars, the black upon the primaries and their coverts; the tail-feathers barred transversely with black on a grey ground, which is so mottled as to bear a striking resemblance to the soft pencilling of many Sphingidæ; tail broad, very slightly rounded. The feathers of the head lax, and fur-like. Inner surface of the wings black, spotted with white. A streak of black runs on each side the throat, nearly parallel with and close to the gape; a bay tint prevails on the breast; and some of the feathers there have broad terminal spots of black, which are arranged in somewhat of a crescent-form, having irregular spots above it. Under parts pale grey unmottled. Every feather of the whole plumage is marked with a black stripe down the centre. Tongue sagittiform, wide at the horns, slender towards the tip, fleshy; reverted barbs along the edges. The volume of brain excessively small. Intestine 10¹⁄₂ inches; two cæca 1¹⁄₂ in. long, dilated at the ends. Both the Whip-poor-will and the Chuck-will’s-widow have been assigned to Jamaica; neither of these vociferous and unmistakable birds, however, have fallen under my observation there. It is not improbable that the present bird has been mistaken by careless observers for the Chuck-will’s-widow, though comparatively a silent species.