"Nephaecetes niger borealis. Northern Black Cloud Swift. Entire plumage sooty-black, with slight greenish gloss, little below than above, the feathers of head and belly with grayish edges. A velvety black area in front of eye; forehead hoary; eye-lids partly naked. Bill black; feet probably dusky-purplish in life." Elliot Coues, 1884

Northern Black Cloud Swift

"Nephaecetes niger borealis. Northern Black Cloud Swift. Entire plumage sooty-black, with slight greenish…