We have two species of the Goatsucker Family (_Caprimulgidæ_), including the Whippoorwill (_Antrostomus vociferus_), and the Southern Whippoorwill, or Chuck-will’s-widow (_Antrostomus Carolinensis_). The closely allied Night-Hawk, or Bull-Bat (_Chordeiles Virginianus_), is often mistaken for the Northern Whippoorwill. Its habits and flight are far different, however, although the homes of both are similarly adopted. The Night-Hawk deposits her two buff-green eggs on rocks, bare ground, or on flat roofs, either in country or village. All of these birds winter in the Southern lands, and all save the Chuck-will’s-widow arrive here about the third week in May, returning with their broods the latter part of September. The Twilight-Hawk preys upon other birds and moths. I have observed him at twilight, on a cloudy day in autumn, circling and diving down among the weeds about a potato field, where sparrows were feeding in great numbers. The sparrows flew in fear toward the house, one driving so forcefully against the window-pane that he dropped to the ground with a broken neck. This Night-Hawk gives forth a peculiar moan or call,—“Peent,”—accompanied by a booming, buzzing sound in flight, as the wind passes through the quills of its feathers. It whizzes swiftly through the air, swooping down upon its prey about the fields or garden. The leaves of the Pink Moccasins—sometimes called Whippoorwill’s-Shoes—were numerous about the place, the flowers serving, near the ever-changing nests, to attract the insects and moths upon which the birds feed. I found another oven-bird’s thatched nest in Witch Hollow region, late in June, very near the colony of Ram’s-Head Cypripediums. On my return to secure a photograph of it, I found that some animal—perhaps a dog or skunk—had torn the nest to pieces and devoured the birdlings. The Small Round-Leaved Orchis, which formerly I observed in Chalk Pond region, has developed into the varietal form of this species—producing oblong leaves—known as _Habenaria oblongifolia_. This often occurs when the flower is in company with the true Round-Leaved Orchis. This season I have instanced the fact in another colony of these orchids, in Rattlesnake Swamp. The flowers found on the summit of the Dome, three thousand feet above sea level, are slightly modified in size and coloring. They are fully two or three weeks later in blooming than the same species flourishing in the Hoosac Lowlands.